English

Pell Numbers whose Euler Function is a Pell Number

Number Theory 2015-08-25 v1

Abstract

In this paper, we show that the only Pell numbers whose Euler function is also a Pell number are 11 and 22.

Cite

@article{arxiv.1508.05714,
  title  = {Pell Numbers whose Euler Function is a Pell Number},
  author = {Bernadette Faye and Florian Luca},
  journal= {arXiv preprint arXiv:1508.05714},
  year   = {2015}
}
R2 v1 2026-06-22T10:39:56.243Z