English

Consecutive primes and Legendre symbols

Number Theory 2019-09-06 v5

Abstract

Let mm be any positive integer and let δ1,δ2{1,1}\delta_1,\delta_2\in\{1,-1\}. We show that for some constanst Cm>0C_m>0 there are infinitely many integers n>1n>1 with pn+mpnCmp_{n+m}-p_n\le C_m such that (pn+ipn+j)=δ1 and (pn+jpn+i)=δ2\left(\frac{p_{n+i}}{p_{n+j}}\right)=\delta_1\ \quad\text{and}\ \quad\left(\frac{p_{n+j}}{p_{n+i}}\right)=\delta_2 for all 0i<jm0\le i<j\le m, where pkp_k denotes the kk-th prime, and (p)(\frac {\cdot}p) denotes the Legendre symbol for any odd prime pp. We also prove that under the Generalized Riemann Hypothesis there are infinitely many positive integers nn such that pn+ip_{n+i} is a primitive root modulo pn+jp_{n+j} for any distinct ii and jj among 0,1,,m0,1,\ldots,m.

Keywords

Cite

@article{arxiv.1406.5951,
  title  = {Consecutive primes and Legendre symbols},
  author = {Hao Pan and Zhi-Wei Sun},
  journal= {arXiv preprint arXiv:1406.5951},
  year   = {2019}
}

Comments

12 pages, final published version

R2 v1 2026-06-22T04:44:55.791Z