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.
The Tower of Hanoi
How to subtract?
Make a random, non-repeating vector.
Add two numbers
Inscribed Pentagon? 2
Rule of mixtures (composites) - weighted bound
Divisible by 7
Scrabble Scores - 6
Divisible by 9
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