Said Zriaa
Published 2023-02-14Version 1
By using the elementary symmetric polynomials and some results of number theory, we solve the well known problem of Lehmer on Euler's totient function. As application, we obtain a new characterization of prime numbers.
Arithmetic properties of sets and sums related to Euler's totient function
Numbers of the form $kf(k)$
Gaps between totients
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