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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
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en.wikipedia.org/w/index.php?title=Farey_sequence&oldid=1223364653#Sequence_length_and_index_of_a_fraction
∣
F
n
∣
=
1
+
Φ
(
n
)
(1)
where
Φ
(
n
)
is the
totient summatory function
.
Ancestors
(8)
Reduced fraction
Fraction
Rational number
Number
Formalization of mathematics
Area of mathematics
Mathematics
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PROMYS Europe 2024 problem set
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Set 2
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