Prime Number Spiral 9.00 The Prime Number Spiral (a.k.a. the Ulam Spiral) is formed by marking the prime numbers in a spiral arrangement of the natural numbers. This is software is for exploring the Prime Number Spiral.
Valgetal - tons of fun for real number-crunchers! First released in 1985, Tetris has been cloned and modified a countless number of times. Today, it is available on virtually every gaming platform ever released in hundreds of variations and can well be called the most popular game of all times. Although Tetris is a game, entertainment is not its primary purpose. Tetris improves your