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On the set of values of the Euler function. (Russian) Zbl 1052.11502
The Euler function \(\varphi(m)\) expresses the number of natural numbers in an interval \([1,m]\) that are coprime to \(m\). Some results concerning solutions of the functional equation \(\varphi(x)=n\) are proved.
MSC:
11A25 Arithmetic functions; related numbers; inversion formulas
11A41 Primes
Keywords:
Euler function
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