{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-09-03T01:10:40.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-09-03T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":61476,"title":"Check if an FAA N-Number is Valid","description":"An N-number is a unique registration assigned by the Federal Aviation Administration (FAA) to every civil aircraft operating in the United States. Think of it as the aviation equivalent of a license plate. N-Numbers consist of a series of alphanumeric characters. U.S. registration numbers may not exceed five characters in addition to the standard U.S. registration prefix letter N. These characters may be:\r\nOne to five numbers (e.g. N12345)\r\nOne to four numbers followed by one letter (e.g. N1234Z)\r\nOne to three numbers followed by two letters (e.g. N123AZ)\r\nIn addition there are the following restrictions:\r\nThe first character must be a number 1 through 9 (e.g. N012C is invalid)\r\nThe number cannot contain the letters 'O' or 'I' to avoid confusion with numbers '0' and '1' (e.g. N45O is invalid)\r\nGiven an N-number, return true if it is valid and false if it is not.","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.44px; min-height: 0px; white-space: normal; color: rgb(33, 33, 33); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: none; white-space: normal; \"\u003e\u003cdiv style=\"block-size: 267.188px; display: block; min-width: 0px; padding-block-start: 0px; padding-inline-start: 2px; padding-left: 2px; padding-top: 0px; perspective-origin: 468.5px 133.594px; transform-origin: 468.5px 133.594px; vertical-align: baseline; \"\u003e\u003cdiv style=\"block-size: 63px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 444.5px 31.5px; text-align: left; transform-origin: 444.5px 31.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eAn N-number is a unique registration assigned by the Federal Aviation Administration (FAA) to every civil aircraft operating in the United States. Think of it as the aviation equivalent of a license plate. N-Numbers consist of a series of alphanumeric characters. U.S. registration numbers may not exceed five characters in addition to the standard U.S. registration prefix letter N. These characters may be:\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003cul style=\"block-size: 61.3125px; font-family: Helvetica, Arial, sans-serif; list-style-type: square; margin-block-end: 20px; margin-block-start: 10px; margin-bottom: 20px; margin-top: 10px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 451.5px 30.6562px; transform-origin: 451.5px 30.6562px; margin-top: 10px; margin-bottom: 20px; \"\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eOne to five numbers (e.g. N12345)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eOne to four numbers followed by one letter (e.g. N1234Z)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eOne to three numbers followed by two letters (e.g. N123AZ)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003c/ul\u003e\u003cdiv style=\"block-size: 21px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 444.5px 10.5px; text-align: left; transform-origin: 444.5px 10.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eIn addition there are the following restrictions:\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003col style=\"block-size: 40.875px; font-family: Helvetica, Arial, sans-serif; list-style-type: decimal; margin-block-end: 20px; margin-block-start: 10px; margin-bottom: 20px; margin-top: 10px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 451.5px 20.4375px; transform-origin: 451.5px 20.4375px; margin-top: 10px; margin-bottom: 20px; \"\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eThe first character must be a number 1 through 9 (e.g. N012C is invalid)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eThe number cannot contain the letters 'O' or 'I' to avoid confusion with numbers '0' and '1' (e.g. N45O is invalid)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003c/ol\u003e\u003cdiv style=\"block-size: 21px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 444.5px 10.5px; text-align: left; transform-origin: 444.5px 10.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eGiven an N-number, return true if it is valid and false if it is not.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function TF = IsValid(N_number)\r\n    TF=true;\r\nend","test_suite":"%% Test Case 1\r\nN_number='N1';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 2\r\nN_number='N299OV';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 3\r\nN_number='N12345';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 4\r\nN_number='N7TT';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 5\r\nN_number='N9CLP';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 6\r\nN_number='N8W';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 7\r\nN_number='N491652';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 8\r\nN_number='NN65UK';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 9\r\nN_number='N453RD';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 10\r\nN_number='N765G9';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 11\r\nN_number='NY';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 12\r\nN_number='N56BY';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 13\r\nN_number='N55A';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 14\r\nN_number='N66';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 15\r\nN_number='3409R';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 16\r\nN_number='N45I';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 17\r\nN_number='NC2013';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 18\r\nN_number='N05D';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 19\r\nN_number='N113P';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 20\r\nN_number='N-3452';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 21\r\nN_number='N9999M';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 22\r\nN_number='N 2338';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 23\r\nN_number='N88j';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 24\r\nN_number='N9224';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 25\r\nN_number='N909';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":4910069,"edited_by":4910069,"edited_at":"2026-09-11T20:18:49.000Z","deleted_by":null,"deleted_at":null,"solvers_count":4,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2026-09-10T15:21:58.000Z","updated_at":"2026-09-11T20:18:49.000Z","published_at":"2026-09-10T17:56:23.000Z","restored_at":null,"restored_by":null,"spam":null,"simulink":false,"admin_reviewed":false,"description_opc":"{\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAn N-number is a unique registration assigned by the Federal Aviation Administration (FAA) to every civil aircraft operating in the United States. Think of it as the aviation equivalent of a license plate. N-Numbers consist of a series of alphanumeric characters. U.S. registration numbers may not exceed five characters in addition to the standard U.S. registration prefix letter N. These characters may be:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOne to five numbers (e.g. N12345)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOne to four numbers followed by one letter (e.g. N1234Z)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOne to three numbers followed by two letters (e.g. N123AZ)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn addition there are the following restrictions:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe first character must be a number 1 through 9 (e.g. N012C is invalid)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number cannot contain the letters 'O' or 'I' to avoid confusion with numbers '0' and '1' (e.g. N45O is invalid)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven an N-number, return true if it is valid and false if it is not.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\",\"relationship\":null}],\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"target\":\"/matlab/document.xml\",\"relationshipId\":\"rId1\"}]}"}],"problem_search":{"problems":[{"id":61476,"title":"Check if an FAA N-Number is Valid","description":"An N-number is a unique registration assigned by the Federal Aviation Administration (FAA) to every civil aircraft operating in the United States. Think of it as the aviation equivalent of a license plate. N-Numbers consist of a series of alphanumeric characters. U.S. registration numbers may not exceed five characters in addition to the standard U.S. registration prefix letter N. These characters may be:\r\nOne to five numbers (e.g. N12345)\r\nOne to four numbers followed by one letter (e.g. N1234Z)\r\nOne to three numbers followed by two letters (e.g. N123AZ)\r\nIn addition there are the following restrictions:\r\nThe first character must be a number 1 through 9 (e.g. N012C is invalid)\r\nThe number cannot contain the letters 'O' or 'I' to avoid confusion with numbers '0' and '1' (e.g. N45O is invalid)\r\nGiven an N-number, return true if it is valid and false if it is not.","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.44px; min-height: 0px; white-space: normal; color: rgb(33, 33, 33); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: none; white-space: normal; \"\u003e\u003cdiv style=\"block-size: 267.188px; display: block; min-width: 0px; padding-block-start: 0px; padding-inline-start: 2px; padding-left: 2px; padding-top: 0px; perspective-origin: 468.5px 133.594px; transform-origin: 468.5px 133.594px; vertical-align: baseline; \"\u003e\u003cdiv style=\"block-size: 63px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 444.5px 31.5px; text-align: left; transform-origin: 444.5px 31.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eAn N-number is a unique registration assigned by the Federal Aviation Administration (FAA) to every civil aircraft operating in the United States. Think of it as the aviation equivalent of a license plate. N-Numbers consist of a series of alphanumeric characters. U.S. registration numbers may not exceed five characters in addition to the standard U.S. registration prefix letter N. These characters may be:\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003cul style=\"block-size: 61.3125px; font-family: Helvetica, Arial, sans-serif; list-style-type: square; margin-block-end: 20px; margin-block-start: 10px; margin-bottom: 20px; margin-top: 10px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 451.5px 30.6562px; transform-origin: 451.5px 30.6562px; margin-top: 10px; margin-bottom: 20px; \"\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eOne to five numbers (e.g. N12345)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eOne to four numbers followed by one letter (e.g. N1234Z)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eOne to three numbers followed by two letters (e.g. N123AZ)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003c/ul\u003e\u003cdiv style=\"block-size: 21px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 444.5px 10.5px; text-align: left; transform-origin: 444.5px 10.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eIn addition there are the following restrictions:\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003col style=\"block-size: 40.875px; font-family: Helvetica, Arial, sans-serif; list-style-type: decimal; margin-block-end: 20px; margin-block-start: 10px; margin-bottom: 20px; margin-top: 10px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 451.5px 20.4375px; transform-origin: 451.5px 20.4375px; margin-top: 10px; margin-bottom: 20px; \"\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eThe first character must be a number 1 through 9 (e.g. N012C is invalid)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003cli style=\"block-size: 20.4375px; display: list-item; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-start: 56px; margin-left: 56px; margin-top: 0px; perspective-origin: 423.5px 10.2188px; text-align: left; transform-origin: 423.5px 10.2188px; white-space-collapse: preserve; margin-left: 56px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-inline-start: 0px; margin-left: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eThe number cannot contain the letters 'O' or 'I' to avoid confusion with numbers '0' and '1' (e.g. N45O is invalid)\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003c/ol\u003e\u003cdiv style=\"block-size: 21px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 444.5px 10.5px; text-align: left; transform-origin: 444.5px 10.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; unicode-bidi: normal; \"\u003e\u003cspan style=\"\"\u003eGiven an N-number, return true if it is valid and false if it is not.\u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function TF = IsValid(N_number)\r\n    TF=true;\r\nend","test_suite":"%% Test Case 1\r\nN_number='N1';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 2\r\nN_number='N299OV';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 3\r\nN_number='N12345';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 4\r\nN_number='N7TT';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 5\r\nN_number='N9CLP';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 6\r\nN_number='N8W';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 7\r\nN_number='N491652';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 8\r\nN_number='NN65UK';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 9\r\nN_number='N453RD';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 10\r\nN_number='N765G9';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 11\r\nN_number='NY';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 12\r\nN_number='N56BY';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 13\r\nN_number='N55A';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 14\r\nN_number='N66';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 15\r\nN_number='3409R';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 16\r\nN_number='N45I';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 17\r\nN_number='NC2013';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 18\r\nN_number='N05D';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 19\r\nN_number='N113P';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 20\r\nN_number='N-3452';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 21\r\nN_number='N9999M';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 22\r\nN_number='N 2338';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 23\r\nN_number='N88j';\r\nTF = IsValid(N_number)\r\nassert(~TF)\r\n\r\n%% Test Case 24\r\nN_number='N9224';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n\r\n%% Test Case 25\r\nN_number='N909';\r\nTF = IsValid(N_number)\r\nassert(TF)\r\n","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":4910069,"edited_by":4910069,"edited_at":"2026-09-11T20:18:49.000Z","deleted_by":null,"deleted_at":null,"solvers_count":4,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2026-09-10T15:21:58.000Z","updated_at":"2026-09-11T20:18:49.000Z","published_at":"2026-09-10T17:56:23.000Z","restored_at":null,"restored_by":null,"spam":null,"simulink":false,"admin_reviewed":false,"description_opc":"{\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAn N-number is a unique registration assigned by the Federal Aviation Administration (FAA) to every civil aircraft operating in the United States. Think of it as the aviation equivalent of a license plate. N-Numbers consist of a series of alphanumeric characters. U.S. registration numbers may not exceed five characters in addition to the standard U.S. registration prefix letter N. These characters may be:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOne to five numbers (e.g. N12345)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOne to four numbers followed by one letter (e.g. N1234Z)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOne to three numbers followed by two letters (e.g. N123AZ)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn addition there are the following restrictions:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe first character must be a number 1 through 9 (e.g. N012C is invalid)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number cannot contain the letters 'O' or 'I' to avoid confusion with numbers '0' and '1' (e.g. N45O is invalid)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven an N-number, return true if it is valid and false if it is not.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\",\"relationship\":null}],\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"target\":\"/matlab/document.xml\",\"relationshipId\":\"rId1\"}]}"}],"errors":[],"facets":[[],[{"value":"medium","count":1,"selected":false}]],"term":"tag:\"faa\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}