%0 Journal Article
%A De Koninck,  Jean-Marie
%A Luca,  Florian
%T Positive integers \(n\) such that \(\sigma(\varphi(n))=\sigma(n)\)
%J Journal of integer sequences
%D 2008
%V 11
%N 1
%U http://geodesic.mathdoc.fr/item/JIS_2008__11_1_a5/
%G en
%F JIS_2008__11_1_a5