The K-smooth integers on a generalized Ulam spiral [Les entiers K-friables sur une spirale d'Ulam généralisée].

Starting from the center of the picture, the spheres are numbered (N=2,..., 261122) when following a square spiral. The radius of the sphere displaying the number N is an increasing function of the logarithm of the smoothness K of N (K being the largest prime factors of N).

Nota: the logarithm of K (inside [2,12.472] and renormalized inside [2,255]) is displayed using the following palette. Then the luminance is a decreasing function of the logarithm of K.

[Plus d'informations à propos de la spirale d'Ulam et de ses généralisations -en français/in french-]
[More information about the Ulam spiral and ist generalizations -in english/en anglais-]

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