PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 64(78), pp. 920 (1998) 

ON A SUM OF DIVISORS PROBLEMJeanMarie De Koninck and Aleksandar Ivi\'cDépartement de Mathématiques, Université Laval, G1K 7P4 Québec, Canada and Katedra Matematike RGFa, Universiteta u Beogradu, Dju\v sina 7, Beograd, Serbia (Yugoslavia)Abstract: Several results concerning the set $\S$ are proved. This set was constructed by A. Granville as follows: Let $1\in\Cal S$, and for $n\in\Bbb N$ and $n>1$ let $n\in\Cal S$ if $\sum_{dn,d Classification (MSC2000): 11N25, 11N37 Full text of the article:
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