If you've worked in science, engineering a...  ...Method was thought up by mathematician Stanislaw Ulam , who was playing solitaire on his hospital bed wh...

The Ulam Spiral is a pattern of prime numbers di...  ...that revealed a pattern. (Left) Ulam started by writing a grid of numbers, starting wi...  ...of them form diagonal lines (Right) An Ulam spiral of size 200 x 200, with black do...