English

On some determinants arising from quadratic residues

Number Theory 2024-04-18 v1

Abstract

Let p>3p>3 be a prime, and let dZd\in\mathbb Z with pdp\nmid d. For the determinants Sm(d,p)=det[(i2+dj2)m]1i,j(p1)/2  (p12mp1),S_m(d,p)=\det\left[(i^2+dj^2)^{m}\right]_{1\leqslant i,j \leqslant (p-1)/2}\ \ \left(\frac{p-1}2\leqslant m\leqslant p-1\right), Sun recently determined Sm(d,p)S_m(d,p) modulo pp when m{p2,p3}m\in\{p-2,p-3\} and (dp)=1(\frac {-d}p)=-1. In this paper, we obtain Sp2(d,p)S_{p-2}(d,p) modulo pp in the remaining case (dp)=1(\frac{-d}p)=1, and determine the Legendre symbols (Sp3(d,p)p)(\frac{S_{p-3}\,(d,p)}p) and (Sp4(d,p)p)(\frac{S_{p-4}\,(d,p)}p) in some special cases.

Keywords

Cite

@article{arxiv.2404.11547,
  title  = {On some determinants arising from quadratic residues},
  author = {Chen-Kai Ren and Zhi-Wei Sun},
  journal= {arXiv preprint arXiv:2404.11547},
  year   = {2024}
}

Comments

14 pages

R2 v1 2026-06-28T15:57:34.597Z