English

On consecutive abundant numbers

Number Theory 2016-03-22 v1

Abstract

A positive integer nn is called an abundant number if σ(n)2n\sigma (n)\ge 2n, where σ(n)\sigma (n) is the sum of all positive divisors of nn. Let E(x)E(x) be the largest number of consecutive abundant numbers not exceeding xx. In 1935, P. Erd\H os proved that there are two positive constants c1c_1 and c2c_2 such that c1logloglogxE(x)c2logloglogxc_1\log\log\log x\le E(x)\le c_2\log\log\log x. In this paper, we resolve this old problem by proving that, E(x)/logloglogxE(x)/\log \log\log x tends to a limit as x+x\to +\infty, and the limit value has an explicit form which is between 33 and 44.

Keywords

Cite

@article{arxiv.1603.06176,
  title  = {On consecutive abundant numbers},
  author = {Yong-Gao Chen and Hui Lv},
  journal= {arXiv preprint arXiv:1603.06176},
  year   = {2016}
}

Comments

14pages

R2 v1 2026-06-22T13:14:39.517Z