Showing what's behind the curtain

Finding Nim positions consisting of heap sizes n, 2n and 3n for n ≤ 2^{30} that result in a losing game.

Powers With Trailing Digits

Prove analytically that the sum of the squares of the four sides of a parallelogram is equal to the sum of the squares of the diagonals.

Missing Term in an Arithmetic Progression

Magic Squares While working on an idea for maximizing a return on a financial portfolio using magic squares, we though we would share our Python code in case someone else may have some use for it. import string def make_magic_square(n): if n < 1 or n == 2: return False if n % 2 == […]

Make plurals of English words from the given input

Build a fence to maximize an area enclosed between the fence and a fixed wall

Add two reversed numbers and output their reversed sum

Find the number of trailing zeros in a factorial

Find the largest volume of a cylinder cut and formed from a sheet of paper