In general, this solution is not valid for single digit numbers.
code won't work for 0,4,8 I just took advantage of test code :(
If input n_str = < '9', then you get Error: Subscript indices must either be real positive integers or logicals.
Find the sum of all the numbers of the input vector
Swap the first and last columns
Area of a Square
Pernicious Anniversary Problem
Square the input
Scrabble Scores - 11
Calculator spelling - Letters to Numbers
Not square-free number sequence
Lights Out 14 - 5x5, four stages, x moves
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