For given positive integer n, what is the last non-zero digit of n!?
Example: factorial(11) = 39916800
Last non-zero digit is 8.
Optional: Can you make an efficient algorithm for very large n?
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.
Which values occur exactly three times?
Determine if a Given Number is a Triangle Number
Number of Horns on a unicorn!
Is the input divisible by 3?
Number of paths on a n-dimensional grid
Number of even divisors of a given number
Smallest n, for n! to have m trailing zero digits
Equal temperament - musical notes and frequency
Number of paths on a 3d grid
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