Some Integer Apollonian Circle Packings Apollonian circle packings are configurations where the two circles tangent to each triple of tangent circles are also contained in the packing. In the configurations below, each circle has integer curvature (the reciprocal of its radius).

-3 4 12 13

-3 5 8 8

-7 12 17 20

Created with the J-script ac3.ijs

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See also:
· An expository article on Apollonian circle packings by David Austin.
· Article on Vector Web Site