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.
Finding Perfect Squares
Back to basics 8 - Matrix Diagonals
Who knows the last digit of pi?
Back to basics 21 - Matrix replicating
Replace multiples of 5 with NaN
Combined Ages 4 - Non-symmetric with multiples, n ≥ 3
Divisible by 10
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