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.
Project Euler: Problem 9, Pythagorean numbers
Set some matrix elements to zero
Switch matrix to a column vector
Concatenate two strings
Scrabble Scores - 4
Divisible by 5
Divisible by n, Truncated-number Divisors
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