English

Perfect powers in products of terms of elliptic divisibility sequences

Number Theory 2016-07-27 v1

Abstract

Diophantine problems involving recurrence sequences have a long history and is an actively studied topic within number theory. In this paper, we connect to the field by considering the equation \begin{align*} B_mB_{m+d}\dots B_{m+(k-1)d}=y^\ell \end{align*} in positive integers m,d,k,ym,d,k,y with gcd(m,d)=1\gcd(m,d)=1 and k2k\geq 2, where 2\ell\geq 2 is a fixed integer and B=(Bn)n=1B=(B_n)_{n=1}^\infty is an elliptic divisibility sequence, an important class of non-linear recurrences. We prove that the above equation admits only finitely many solutions. In fact, we present an algorithm to find all possible solutions, provided that the set of \ell-th powers in BB is given. (Note that this set is known to be finite.) We illustrate our method by an example.

Keywords

Cite

@article{arxiv.1604.03707,
  title  = {Perfect powers in products of terms of elliptic divisibility sequences},
  author = {Lajos Hajdu and Shanta Laishram and Márton Szikszai},
  journal= {arXiv preprint arXiv:1604.03707},
  year   = {2016}
}

Comments

To appear in Bulletin of Australian Math Society