Are you in or are you out?
Rotate input square matrix 90 degrees CCW without rot90
Sum of series III
Pernicious Anniversary Problem
Smallest n, for n! to have m trailing zero digits
Number of even divisors of a given number
Make a rainbow matrix (follow-up to checkerboard matrix)
Under the sea: Snell's law & total internal reflection
Equal temperament - musical notes and frequency
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