Search: id:A134612
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%I A134612
%S A134612 1,4,8,9,16,25,27,32,49,64,81,121,125,128,169,243,256,289,343,361,512,
%T A134612 529,625,729,841,961,1024,1331,1369,1681,1849,2048,2187,2197,2209,2401,
%U A134612 2809,3125,3481,3721,4096,4489,4913,5041,5329,6241,6561,6859,6889,7921
%N A134612 Nonprime numbers such that the cube mean of their prime factors is a 
               prime (where the cube mean of c and d is ((c^3+d^3)/2)^(1/3)).
%C A134612 All perfect prime powers (A025475) are included.
%e A134612 a(5)=25, since 25=5*5 and ((5^3+5^3)/2)^(1/3)=5.
%Y A134612 Cf. A001597, A025475, A134333, A134344, A134376.
%Y A134612 Cf. A134600, A134602, A134605, A134614, A134617, A134619, A134621.
%Y A134612 Sequence in context: A134600 A134601 A134611 this_sequence A025475 A125643 
               A002760
%Y A134612 Adjacent sequences: A134609 A134610 A134611 this_sequence A134613 A134614 
               A134615
%K A134612 nonn
%O A134612 1,2
%A A134612 Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Nov 11 2007

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