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.
Extract leading non-zero digit
Find last zero for each column
Divisible by 16
Recaman Sequence - I
Word Search Solver
Divisible by 6
Rule of mixtures (composites) - lower bound
Highly divisible triangular number (inspired by Project Euler 12)
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