Density of non-residues in Burgess-type intervals and applications

Mathematics – Number Theory

Scientific paper

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In the new version we use an idea of Roger Heath-Brown (who is now a co-author) to simply the proof and improve the main resul

Scientific paper

We show that for any fixed $\eps>0$, there are numbers $\delta>0$ and $p_0\ge 2$ with the following property: for every prime $p\ge p_0$ and every integer $N$ such that $p^{1/(4\sqrt{e})+\eps}\le N\le p$, the sequence $1,2,...,N$ contains at least $\delta N$ quadratic non-residues modulo $p$. We use this result to obtain strong upper bounds on the sizes of the least quadratic non-residues in Beatty and Piatetski--Shapiro sequences.

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