Abstract
D. Shanks [11] has given a heuristical argument for the fact that there are “more” primes in the non-quadratic residue classes modq than in the quadratic ones. In this paper we confirmShanks' conjecture in all casesq<25 in the following sense. Ifl 1 is a quadratic residue,l 2 a non-residue modq, ε(n, q, l 1,l 2) takes the values +1 or −1 according ton≢l 1 orl 2 modq, then
for 0≤α<1/2. In the general case the same holds, if all zeros ϱ=β+yγ of allL(s, χ modq),q fix, satisfy the inequality β2−γ2<1/4.
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Bentz, H.J., Pintz, J. Quadratic residues and the distribution of prime numbers. Monatshefte für Mathematik 90, 91–100 (1980). https://doi.org/10.1007/BF01303260
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DOI: https://doi.org/10.1007/BF01303260