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.
Find the alphabetic word product
Return the first and last character of a string
Replace multiples of 5 with NaN
Divisible by 2
Equal temperament - musical notes and frequency
The number of trailing zero digit of a factorial
Number of paths on a n-dimensional grid
Fractal: area and perimeter of Koch snowflake
Smallest n, for n! to have m trailing zero digits
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