English

On convergence of the Flint Hills series

Classical Analysis and ODEs 2011-04-28 v1 Number Theory

Abstract

It is not known whether the Flint Hills series n=11n3sin(n)2\sum_{n=1}^{\infty} \frac{1}{n^3\cdot\sin(n)^2} converges. We show that this question is closely related to the irrationality measure of π\pi, denoted μ(π)\mu(\pi). In particular, convergence of the Flint Hills series would imply μ(π)2.5\mu(\pi) \leq 2.5 which is much stronger than the best currently known upper bound μ(π)7.6063...\mu(\pi)\leq 7.6063.... This result easily generalizes to series of the form n=11nusin(n)v\sum_{n=1}^{\infty} \frac{1}{n^u\cdot |\sin(n)|^v} where u,v>0u,v>0. We use the currently known bound for μ(π)\mu(\pi) to derive conditions on uu and vv that guarantee convergence of such series.

Keywords

Cite

@article{arxiv.1104.5100,
  title  = {On convergence of the Flint Hills series},
  author = {Max A. Alekseyev},
  journal= {arXiv preprint arXiv:1104.5100},
  year   = {2011}
}