On Almost Lehmer Numbers
Center for Japanese Language and Culture
562-8558, 8-1-1, Aomatanihigashi
We consider composite numbers n such that φ(n) divides
ℓ(n– 1) for some squarefree divisor ℓ of
– 1. We discuss two cases, according to whether the number of prime
factors of ℓ is bounded or not. We give a few instances and upper
bounds for the number of such integers below a given number.
Full version: pdf,
(Concerned with sequences
Received November 24 2020; revised versions received November 25 2020; February 25 2021.
Published in Journal of Integer Sequences,
April 25 2021.
Journal of Integer Sequences home page