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 grey level of the N-th point is proportional
to the number of divisors of N.
This picture makes use of variable-radius spheres
to display the number of divisors of N.
(CMAP28 WWW site: this page was created on 05/29/1997 and last updated on 04/26/2015
12:25:05 -CEST-)
This picture makes use of variable-radius spheres
to display the number of divisors of N.