Values of the Carmichael Function Equal to a Sum of Two Squares

Authors: WILLIAM D. BANKS, AHMET M. GÜLOĞLU

Abstract: In this note, we determine the order of growth of the number of positive integers n \le x such that \lambda(n) is a sum of two square numbers, where \lambda(n) is the Carmichael function.

Keywords: Carmichael function, sum of two squares

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