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EulerPhi
 EulerPhi[n] gives the Euler totient function  .
Integer mathematical function (see Section A.3.10).
 gives the number of positive integers less than or equal to  which are relatively prime to  .
See The Mathematica Book: Section 3.2.4.
See also: FactorInteger, Divisors, MoebiusMu, MultiplicativeOrder, CarmichaelLambda, PowerMod.
Further Examples
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