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Error is known to be O(xlog^(2/3)x)$O(x \log^{2/3}x)$. See Walfisz's book on exponential sums
Error is known to be O(xlog^(2/3)x). See Walfisz's book on exponential sums
Error is known to be $O(x \log^{2/3}x)$. See Walfisz's book on exponential sums
