For given positive integer n, take factorial of that number. How many trailing zeros does it have?
Example: factorial(11) = 39916800
Its last zero-digit count is 2.
Optional: Can you make an efficient algorithm for a very large n?
Times 2 - START HERE
Extract leading non-zero digit
Find common elements in matrix rows
Sum of series III
Times 3 problem
Number of paths on a 3d grid
Make a rainbow matrix (follow-up to checkerboard matrix)
Number of even divisors of a given number
Smallest n, for n! to have m trailing zero digits
Fractal: area and perimeter of Koch snowflake
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