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.
Prime factor digits
String substitution, sub problem to cryptoMath
Circular Primes (based on Project Euler, problem 35)
Smallest n, for n! to have m trailing zero digits
Number of paths on a 3d grid
Make a rainbow matrix (follow-up to checkerboard matrix)
Equal temperament - musical notes and frequency
The number of trailing zero digit of a factorial
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