On the constant in Burgess' bound for the number of consecutive residues or non-residues

Abstract

We give an explicit version of a result due to D. Burgess. Let $\chi$ be a non-principal Dirichlet character modulo a prime $p$. We show that the maximum number of consecutive integers for which $\chi$ takes on a particular value is less than $\left\{\frac{\pi e\sqrt{6}}{3}+o(1)\right\}{p}^{1/4}\log p$, where the $o(1)$ term is given explicitly.