EMIS ELibM Electronic Journals Publications de l'Institut Mathématique, Nouvelle Série
Vol. 97(111), pp. 175–180 (2015)

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THE SUM OF THE UNITARY DIVISOR FUNCTION

Tim Trudgian

Mathematical Sciences Institute, The Australian National University, Canberra, Australia

Abstract: We establish a new upper bound on the function $\sigma^*(n)$, the sum of all coprime divisors of $n$. The main result is that $\sigma^*(n)\leq 1.3007 n\log\log n$ for all $n\geq 570 571$.

Keywords: unitary divisors; exponential divisors; arithmetic functions

Classification (MSC2000): 11A25; 11N56

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Electronic fulltext finalized on: 16 Apr 2015. This page was last modified: 21 Apr 2015.

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