Based in Honolulu, HI, 3leet5u is a blog by Tristan Madden. His posts are a record of his progression from "HELLO WORLD" to sEASONED PROGRAMMER.

Ulam Spiral

Ulam Spiral

The Ulam spiral or prime spiral (in other languages also called the Ulam cloth) is a graphical depiction of the set of prime numbers, devised by mathematician Stanislaw Ulam in 1963 and popularized in Martin Gardner’s Mathematical Games column in Scientific American a short time later. It is constructed by writing the positive integers in a square spiral and specially marking the prime numbers.

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