DLMF:27.3.E3 (Q8004)

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DLMF:27.3.E3
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    test
    ϕ ⁡ ( n ) = n ⁢ ∏ p | n ( 1 - p - 1 ) , Euler-totient-phi 𝑛 𝑛 subscript product divides 𝑝 𝑛 1 superscript 𝑝 1 {\displaystyle{\displaystyle\phi\left(n\right)=n\prod_{p\mathbin{|}n}(1-p^{-1}% ),}}
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    DLMF:27.3.E3
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