September 06, 2012
The generalized Ulam spiral (La spirale d'Ulam généralisée)
From AVirtualSpaceTimeTravelMachine: "Starting from the center of the picture, the points are numbered (1, 2, 3,...) when following a square spiral. The radius of the N-th sphere is proportional to the number of divisors of N."
September 6, 2012 at 10:01 AM | Permalink
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