The generalized Ulam spiral [La spirale d'Ulam généralisée].

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.

(CMAP28 WWW site: this page was created on 02/01/1999 and last updated on 04/26/2015 12:24:17 -CEST-)

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