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?
Sum all integers from 1 to 2^n
Sum the elements in either diagonal of a square matrix
Union of two set decreasing order
Number of even divisors of a given number
Fractal: area and perimeter of Koch snowflake
Number of paths on a 3d grid
Number of paths on a n-dimensional grid
Smallest n, for n! to have m trailing zero digits
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