http://demonstrations.wolfram.com/FordCircles/
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The Farey sequence Fn for a positive integer n is the set of irreducible rational numbers h/k with 0lt=hlt=klt=n and (h, k) = 1. For example, F4 is 0/1, 1/4, 1/3, 1/2, 2/3, 3/4, 1/1. The Ford circle C(h, k) has radius 1/2k^2 and center (h/k, 1/2k^2). It is...
Contributed by: Ed Pegg Jr
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