Browsing Mathematics publications (MU) by Title "Values of Arithmetical Functions Equal to a Sum of Two Squares"
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Values of Arithmetical Functions Equal to a Sum of Two Squares
(Oxford University Press, 2005)Let '(n) denote the Euler function. In this paper, we determine the order of growth for the number of positive integers n ≤ x for which '(n) is the sum of two square numbers. We also obtain similar results for the Dedekind ...