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Ulam Spiral - Consists of the numbers between 1 and 400, in a square spiral. All the prime numbers are highlighted.
A good way to visually display prime numbers and the idea that the pattern they occur in is not entirely predictable.
1200x1600px 1.07 MB
Aug 13, 2012, 8:09:37 PM
Microsoft Windows Photo Viewer 6.1.7600.16385