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Published online by Cambridge University Press: 20 November 2018
In following a suggestion of S. Chowla to apply a method of C. Hooley [3] to obtain an asymptotic formula for the sum ∑ r(n)r(n+a), where r(n) denotes the number of representations of n≤x
n as the sum of two squares and is
positive integer, we have had to obtain non-trivial estimates for the error term in the asymptotic expansion of
1