Starting from the lower left point, the spheres are
numbered (1, 2, 3,...) on successive lines
in order to build the Eratosthene sieve. The radius of the N-th sphere is proportional
to the square root of the number of divisors of N.
The number 1 and the prime numbers are visualized by means of white spheres
(a smaller one for the number 1).
(this picture was created on 02/05/1999)
(this page -belonging to the CMAP28 site- was last updated on 03/09/2010 22:18:46 -CET-)
