English

The Diophantine equation $P(x)=\overset{r}{\underset{i=1}{\prod}}H_{n_i}$

Number Theory 2026-01-26 v1

Abstract

Naciri proved that for any integer k2k\geq2, the Brocard--Ramanujan equation n!+1=x2n!+1=x^2 has only finitely many integer solutions, assuming x±1x\pm1 is a kk-free integer or a prime power. In the present paper we prove similar statements for equations of the form P(x)=i=1rHniP(x)=\prod_{i=1}^rH_{n_i}, where P(x)P(x) is a polynomial and HniH_{n_i} are divisible sequences.

Keywords

Cite

@article{arxiv.2601.16757,
  title  = {The Diophantine equation $P(x)=\overset{r}{\underset{i=1}{\prod}}H_{n_i}$},
  author = {Saša Novaković},
  journal= {arXiv preprint arXiv:2601.16757},
  year   = {2026}
}

Comments

9 pages, comments are welcome!