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.
Prime factor digits
Set the array elements whose value is 13 to 0
Maximum value in a matrix
Divisible by 5
Musical Note Interval 1 - Diatonic Scale
Lights Out 10 - 5x5, with wrapping, 6 moves
Scrabble Scores - 3
Dice roll - opposite faces
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