Etymology

Farey sequence

Today it means: For a given positive integer n, the sequence of completely reduced fractions between 0 and 1 which, when in lowest terms, have denominators less than or equal to n, arranged in order of increasing size. Full definition →

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The story

Named after British geologist John Farey Sr., whose letter about the sequences was published in the Philosophical Magazine in 1816.

Etymology from Wiktionary, CC BY-SA 4.0.