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.
Summing Digits within Text
Whether the input is vector?
Multiply by 3
Divisible by 14
5th Time's a Charm
Mersenne Primes vs. All Primes
Rumis Scorer 4
Divisible by 8
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