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.
Cell Counting: How Many Draws?
sum of first 'n' terms
multiply by three
Is this is a Tic Tac Toe X Win?
Divisible by 10
Divisible by n, Truncated-number Divisors
Mechanical Advantage of a Gear Train
Self-similarity 1 - Every other term
Divisible by n, prime vs. composite divisors
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