The Ulam spiral displaying 2025 numbers [La spirale d'Ulam montrant 2025 nombres entiers].

Starting from the center of the picture, the 2025 little squares are numbered (N=1, 2, 3,..., 2025) when following a square spiral. The number 1 is the green square when the prime numbers are the white ones.

It is interesting to compare this Ulam spiral to a random pictures containing the same percentage of white squares (15%) .

See the generalized Ulam spiral:

[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-]

(CMAP28 WWW site: this page was created on 04/25/2012 and last updated on 08/22/2020 11:13:44 -CEST-)

[See all related pictures (including this one) [Voir toutes les images associées (incluant celle-ci)]]

[Please visit the related NumberTheory picture gallery [Visitez la galerie d'images NumberTheory associée]]
[Go back to AVirtualMachineForExploringSpaceTimeAndBeyond [Retour à AVirtualMachineForExploringSpaceTimeAndBeyond]]
[The Y2K bug [Le bug de l'an 2000]]

[Site Map, Help and Search [Plan du Site, Aide et Recherche]]
[Mail [Courrier]]
[About Pictures and Animations [A Propos des Images et des Animations]]

Copyright (c) Jean-François Colonna, 2012-2020.
Copyright (c) CMAP (Centre de Mathématiques APpliquées) UMR CNRS 7641 / Ecole Polytechnique, 2012-2020.