Determine if a Given Number is a Triangle Number
Energy of a photon
Back to basics 21 - Matrix replicating
Back to basics 25 - Valid variable names
Lights Out 3 - 5x5, 6 moves
Calculator spelling - Letters to Numbers
Lights Out 2 - 5x5, 4 moves
Lights Out 9 - 5x5, light-only solution? II
Is it really a 5?
Highly divisible triangular number (inspired by Project Euler 12)
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