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Euler's totient function
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== See also == *[[Carmichael function|Carmichael function (λ)]] *[[Dedekind psi function|Dedekind psi function (𝜓)]] *[[Divisor function|Divisor function (σ)]] *[[Duffin–Schaeffer conjecture]] *[[Fermat's little theorem#Generalizations|Generalizations of Fermat's little theorem]] *[[Highly composite number]] *[[Multiplicative group of integers modulo n|Multiplicative group of integers modulo {{mvar|n}}]] *[[Ramanujan sum]] *[[Totient summatory function|Totient summatory function (𝛷)]]
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