Back to basics 22 - Rotate a matrix
Perl 3: shift
Return area of square
average for three points
Lights Out 5 - 5x5, 10 moves
Divisible by n, prime divisors from 20 to 200
Lights Out 15 - 5x5, broken buttons I
Mersenne Primes vs. All Primes
Divisible by n, prime divisors - 11, 13, 17, & 19
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