%I A064605
%S A064605 1,2,8,74,146,150,158,307,526,541,16157,20289,271343,953614
%N A064605 Partial sum of Sigma_2(n) is divisible by n, where Sigma_2(n)=A001157(n).
%C A064605 Analogous sequences for various arithmetical functions are A050226, A056650, 
               A064605-A064607, A064610, A064611, A048290, A062982, A045345.
%F A064605 Mod[Sum{sigma_2(j), j=1..n}, n]=Mod[A064602(n), n]=0
%e A064605 Summarizing divisor-square sums for j=1,...,8 gives 1+5+10+21+26+50+50+85=248, 
               which is divisible by n=8, so 8 is here and the integer quotient 
               is 31.
%Y A064605 A001157, A064602 A050226, A056650, A064605-A064607, A064610-A064612, 
               A048290, A062982, A045345.
%Y A064605 Sequence in context: A013002 A012998 A143760 this_sequence A132039 A002668 
               A093062
%Y A064605 Adjacent sequences: A064602 A064603 A064604 this_sequence A064606 A064607 
               A064608
%K A064605 nonn
%O A064605 1,2
%A A064605 Labos E. (labos(AT)ana.sote.hu), Sep 24 2001