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?
Back to basics 11 - Max Integer
Is this triangle right-angled?
determine the sum of the squares
Even or Odd
Make a rainbow matrix (follow-up to checkerboard matrix)
Equal temperament - musical notes and frequency
Number of paths on a n-dimensional grid
Fractal: area and perimeter of Koch snowflake
The last non-zero digit of a factorial
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