One in not prime!!!
And therefore should not become de-primed.
Swap the first and last columns
Summing Digits within Text
Project Euler: Problem 5, Smallest multiple
Project Euler: Problem 6, Natural numbers, squares and sums.
Energy of a photon
Self-similarity 3 - Every other pair of terms
Lights Out 12 - 5x5, three stages, <7 moves
Scrabble Scores - 3
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