I don't believe this one will work if n=75, the number is divisible by 75, and and the end of the number isn't 75.
Triangle Numbers Below N
Return the first and last character of a string
Divisible by 3
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Scrabble Scores - 2
Divisible by 10
Scrabble Scores - 5
Rule of mixtures (composites) - upper bound
Rumis Scorer 2
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