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Prime SpiralThe numbers arranged in a Spiral
with Primes indicated in black, as first drawn by S. Ulam. Unexpected patterns of diagonal lines are apparent in such a plot,as illustrated in the above grid. References
Dewdney, A. K. ``Computer Recreations: How to Pan for Primes in Numerical Gravel.'' Sci. Amer. 259, 120-123, July 1988.Lane, C. ``Prime Spiral.'' http://www.best.com/~cdl/PrimeSpiralApplet.html. Weisstein, E. W. ``Prime Spiral.'' Mathematica notebook PrimeSpiral.m.
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