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.
Vectorizing, too easy or too hard?
Create an 'arrow-head" matrix
Remove the middle element from a vector
Elements with highest local average
Under the sea: Snell's law & total internal reflection
Fractal: area and perimeter of Koch snowflake
Equal temperament - musical notes and frequency
Smallest n, for n! to have m trailing zero digits
Make a rainbow matrix (follow-up to checkerboard matrix)
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