in problem's explantation, Example in "17" part, it probably is: "3281 is divisible by 17.", not 2392 ?
@bainhome: thanks for catching that; it's been fixed.
Return a list sorted by number of occurrences
Test if a Number is a Palindrome without using any String Operations
Scoring for oriented dominoes
Is it really a 5?
Divisible by n, prime divisors (including powers)
Divisible by 10
Divisible by 12
Rule of mixtures (composites) - lower bound
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