On $k$-Lehmer numbers

Details On $k$-Lehmer numbers On $k$-Lehmer numbers

2010-12-10

arxiv.org/abs/1012.2337v2

Mathematics

Number Theory

Scientific paper

Lehmer's totient problem consists of determining the set of positive integers $n$ such that $\varphi(n)|n-1$ where $\varphi$ is Euler's totient function. In this paper we introduce the concept of $k$-Lehmer number. A $k$-Lehmer number is a composite number such that $\varphi(n)|(n-1)^k$. The relation between $k$-Lehmer numbers and Carmichael numbers leads to a new characterization of Carmichael numbers and to some conjectures related to the distribution of Carmichael numbers which are also $k$-Lehmer numbers.

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