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?
give nth decimal place of pi
The Tower of Hanoi
Find the largest value in the 3D matrix
Sum the elements in either diagonal of a square matrix
Number of even divisors of a given number
Number of paths on a 3d grid
Fractal: area and perimeter of Koch snowflake
Make a rainbow matrix (follow-up to checkerboard matrix)
Equal temperament - musical notes and frequency
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