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.
Back to basics 14 - Keywords
select the primes of a vector
Array of Ones
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Scrabble Scores - 10
Divisible by n, prime divisors - 11, 13, 17, & 19
Tic-Tac-Logic - Solution Checker
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