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Number of elements in a Farey sequence

Ciro Santilli (@cirosantilli, 37) ... Area of mathematics Formalization of mathematics Number Rational number Fraction Reduced fraction
Created 2024-07-12 Updated 2025-07-16  0 By others on same topic  0 Discussions Create my own version
en.wikipedia.org/w/index.php?title=Farey_sequence&oldid=1223364653#Sequence_length_and_index_of_a_fraction
∣Fn​∣=1+Φ(n)
(1)
where Φ(n) is the totient summatory function.

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  • PROMYS Europe 2024 problem set / Set 2 / Q2

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