![]() ![]() Surprisingly, the circled primes appeared to fall along a number of diagonal straight While drawing a grid of lines, he decided to number the intersections according toĪ spiral pattern, and then began circling the numbers in the spiral that were primes. Ulam (1909-1986) in 1963 while doodling during a boring talk at a scientific meeting. This construction was first made by Polish-American mathematician Stanislaw Unexpected patterns of diagonal lines are apparent in such a plot, as illustrated in the above The plot above shows a larger part of the spiral in which the primes are shown as dots. In red and composites are indicated in yellow. In the right plot above, primes are indicated ![]() The prime spiral, also known as Ulam's spiral, is a plot in which the positive integers are arranged in a spiral (left figure), with primes ![]()
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