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On Sums of Two Coprime k-th Powers(II)
Authors:Wenguang Zhai  Xiaodong Cao
Institution:(1) Shandong Normal University, Jinan, Shandong, China;(2) Beijing Institute of Petro-Chemical Technology, Beijing, China
Abstract:For fixed k ≥ 3, let Ek(x) denote the error term of the sum $\sum_{n\le x}\rho_k(n)$ , where $\rho_k(n) = \sum_{n=|m|^k+|l|^k, g.c.d.(m,l)=1} $ 1. It is proved that if the Riemann hypothesis is true, then $E_3(x)\ll x^{331/1254+\varepsilon}$ , $E_4(x)\ll x^{37/184+\varepsilon}$ . A short interval result is also obtained.
Keywords:2000 Mathematics Subject Classifications: 11P21
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