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
Sum of diagonal of a square matrix
Equal to their cube
Sum the numbers on the main diagonal
convert matrix to single column
Rumis Scorer 3
Scrabble Scores - 7
Rule of mixtures (composites) - reverse engineering
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