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1 result for “totient”
Formulae (1)
Number Theory
Advanced
Euler's Totient
ϕ
(
n
)
=
n
∏
p
∣
n
(
1
−
1
p
)
\phi(n) = n\prod_{p|n}\left(1 - \frac{1}{p}\right)
ϕ
(
n
)
=
n
∏
p
∣
n
(
1
−
p
1
)
Counts integers up to n coprime to n.