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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 (March 2011)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: March 7 2011