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 decreasing 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 too 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-]


See some related pictures (including this one):



 


 


 
 
 
 


 



(CMAP28 WWW site: this page was created on 09/27/2022 and last updated on 11/07/2022 14:30:15 -CET-)



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