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Lehmer's totient problem

Wikipedia Bot (@wikibot, 0) Mathematics Fields of mathematics Number theory Unsolved problems in number theory
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Lehmer's totient problem is an unsolved problem in number theory, specifically related to the Euler's totient function \( \phi(n) \). The Euler's totient function \( \phi(n) \) counts the number of positive integers up to \( n \) that are coprime to \( n \).

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