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.
Calculate the Levenshtein distance between two strings
Increment a number, given its digits
Create incrementing array
Check that number is whole number
Under the sea: Snell's law & total internal reflection
Smallest n, for n! to have m trailing zero digits
The number of trailing zero digit of a factorial
Make a rainbow matrix (follow-up to checkerboard matrix)
Number of even divisors of a given number
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