Experimenting with the Ulam Spiral

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The Ulam spiral is named after Stanislaw Ulam, who discovered it by chance in 1963 while doodling on scratch paper at a scientific meeting.
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Contributed by: Giovanna Roda (March 2011)
Open content licensed under CC BY-NC-SA
Snapshots
Details
See also:
Triangle Numbers on Ulam Spiral by Adrian Leatherland http://yoyo.cc.monash.edu.au/~bunyip/primes/triangleUlam.htm
Ulam Spiral Images by Matthew M. Conroy at http://www.madandmoonly.com/doctormatt/mathematics/ulamSpirals/ulamSpirals.htm
Ulam spiral at http://en.wikipedia.org/wiki/Ulam_spiral
Permanent Citation
"Experimenting with the Ulam Spiral"
http://demonstrations.wolfram.com/ExperimentingWithTheUlamSpiral/
Wolfram Demonstrations Project
Published: March 7 2011