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.
Add two numbers
Sum all integers from 1 to 2^n
How to subtract?
Return 'on' or 'off'
Make a rainbow matrix (follow-up to checkerboard matrix)
Under the sea: Snell's law & total internal reflection
Number of paths on a 3d grid
Fractal: area and perimeter of Koch snowflake
Number of paths on a n-dimensional grid
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