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.
First N Perfect Squares
Is X a Fibonacci Matrix?
MATCH THE STRINGS (2 CHAR) very easy
Narcissistic number ?
Predicting life and death of a memory-less light bulb
Not square-free number sequence
Scrabble Scores - 4
Divisible by n, prime divisors - 11, 13, 17, & 19
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