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Ford Circles


	The Farey sequence for a positive integer is the set of irreducible rational numbers with and . For example, is , . The Ford circle has radius and center . It is tangent to the x axis at and to the circles corresponding to the two neighbors of in .


	Contributed by: Ed Pegg Jr

Ford Circle (Wolfram MathWorld)

Farey Sequence (Wolfram MathWorld)

"Ford Circles" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/FordCircles/

Contributed by: Ed Pegg Jr

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