Ulam spiral

(redirected from Ulam's spiral)
Related to Ulam's spiral: Prime spiral

U·lam spiral

 (o͞o′läm′)
n.
A graphical representation of the natural numbers in a spiral formation, showing that the prime numbers, when highlighted, tend to fall in clusters and diagonal lines. Also called prime spiral.

[After Stanislaw Marcin Ulam (1909-1984), Polish-born American mathematician who discovered it.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.