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Ulam spiral
Last updated at 7:49 pm UTC on 30 April 2018
https://tech.labs.oliverwyman.com/blog/2012/09/27/decomposing-the-ulam-spiral/

The Ulam spiral is a well-known mystery to mathematicians: draw a 1 in a grid, 2 in the cell to the right, 3 above the 2, and so on in a spiral.
http://en.wikipedia.org/wiki/Ulam_spiral