One in not prime!!!
And therefore should not become de-primed.
First N Perfect Squares
Back to basics 8 - Matrix Diagonals
Back to basics 21 - Matrix replicating
Calculate the area of a triangle between three points
Create an n-by-n null matrix and fill with ones certain positions
Lights Out 7 - 5x5, x moves
Scrabble Scores - 3
Rule of mixtures (composites) - reverse engineering
Divisible by 16
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