Showing what's behind the curtain

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

Right triangles with integer coordinates

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

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 == […]

Guess That Thingy Places – Answers, Solutions & Cheats: Pack 1 Level 1-50

Hollow Words Answers and Solutions Here are the Hollow Words answers for the popular iPhone/iPad game created by James Porter, who is known for other games like Brain Chain and What’s the Movie. These types of puzzles have been around for centuries. They are a type of rebus and have been taught in schools to […]

Solve SuDoku puzzles

An unexpected way of using two cubes to make a square.