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February 3, 2005Ulam SpiralFrom Wikipedia:
The Ulam spiral, or prime spiral (in other languages also called Ulam cloth) is a simple method of graphing the prime numbers that reveals a pattern which has never been fully explained. It was discovered by the mathematician Stanislaw Marcin Ulam in 1963, while doodling on scratch paper at a scientific meeting. Ulam, bored that day, wrote down a regular grid of numbers, starting with 1 at the center, and spiraling out...
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