Ulam Spiral
The Ulam Spir... ...In 1963, mathematician Stanislaw Ulam was doodling on a scrap paper during a "long... ...that revealed a pattern. (Left) Ulam started by writing a grid of numbers, starting wi... ...bers, starting with 1 at the center and...
https://www.neatorama.com/trivia/2012/09/09/Ulam-Spiral/
