%I A144922
%S A144922 1,4,6,9,12,16,18,20,24,25,28,36,44,45,48,49,50,54,60,64,72,81,90,92,96,
%T A144922 100,108,112,117,121,132,140,144,150,153,162,168,169,180,192,196
%N A144922 Numbers n such that n*sigma_2(n)/sigma_1(n) is an integer
%C A144922 n*A001157(n)/A000203(n) is an integer. This sequence is connected closely 
               with Ore divisor numbers (A001599) and RMS numbers (A140480).
%Y A144922 Cf. A000203, A001157, A001599, A140480
%Y A144922 Sequence in context: A024675 A163656 A100915 this_sequence A088765 A078782 
               A165897
%Y A144922 Adjacent sequences: A144919 A144920 A144921 this_sequence A144923 A144924 
               A144925
%K A144922 easy,nonn
%O A144922 1,2
%A A144922 Ctibor O. Zizka (c.zizka(AT)email.cz), Sep 25 2008