Need a better test suite to prevent cheesy solutions like this one. :-) Some N>10 values in there would help. N>50 would be even better.
Number of Horns on a unicorn!
Is the input divisible by 3?
Swap two numbers
Divisible by 2
Number of paths on a 3d grid
Number of even divisors of a given number
Make a rainbow matrix (follow-up to checkerboard matrix)
Fractal: area and perimeter of Koch snowflake
Smallest n, for n! to have m trailing zero digits
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