Let me be a cheater for this time
Construct an index vector from two input vectors in vectorized fashion
Change the sign of even index entries of the reversed vector
Sum the numbers on the main diagonal
Sum of series III
Write c^3 as sum of two squares a^2+b^2
Divisible by n, prime vs. composite divisors
Lights Out 8 - 5x5, light-only solution? I
Lights Out 2 - 5x5, 4 moves
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