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.
Which doors are open?
Project Euler: Problem 10, Sum of Primes
Length of a short side
Rumis Scorer 2
Mechanical Advantage of a Gear Train
Divisible by 13
Divisible by n, prime vs. composite divisors
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