Search: id:A068970
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%I A068970
%S A068970 1,9,55,137,501,495,2059,2185,4429,4509,13311,7535,26365,18531,27555,
%T A068970 34953,78609,39861,123463,68637,113245,119799,267675,120175,313001,
%U A068970 237285,358723,282083,682893,247995,893731,559241,732105,707481
%N A068970 Sum(phi(d^4)); d|n.
%F A068970 Also Sum( d|n, d^m*phi(d^(4-m))) for m=0, 1, 2, 3
%F A068970 Multiplicative with a(p^e) = 1 + p^3 + (p-1)(p^(4e)-1)/(p^4-1)
%Y A068970 Sequence in context: A058849 A058852 A145875 this_sequence A141530 A016269 
               A005770
%Y A068970 Adjacent sequences: A068967 A068968 A068969 this_sequence A068971 A068972 
               A068973
%K A068970 easy,nonn,mult
%O A068970 1,2
%A A068970 Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2002

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