Euler’s totient (Q10599)

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Euler’s totient
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    Statements

    ϕ ( n ) Euler-totient-phi 𝑛 {\displaystyle{\displaystyle\phi\left(\NVar{n}\right)}}
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    DLMF:27.2.E7
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    C27.S2.E7.m2adec
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    Euler’s totient
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