Search: id:A134601
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%I A134601
%S A134601 1,4,8,9,16,25,27,32,49,64,81,119,121,125,128,161,169,243,256,289,343,
%T A134601 351,361,512,529,595,625,721,729,841,845,959,961,1024,1045,1081,1241,
%U A134601 1323,1331,1369,1375,1547,1681,1792,1849,1855,2048,2187,2197,2209,2401
%N A134601 Nonprime numbers such that the square mean of their prime factors is 
               a prime (where the square mean of c and d is sqrt((c^2+d^2)/2)).
%C A134601 All perfect prime powers (A025475) are included.
%e A134601 a(5)=25, since 25=5*5 and sqrt((5^2+5^2)/2)=5; a(13)=119, since 119=7*17 
               and sqrt((7^2+17^2)/2)=sqrt(169)=13.
%Y A134601 Cf. A001597, A025475, A134333, A134344, A134376.
%Y A134601 Cf. A134600, A134605, A134608, A134611, A134617, A134619, A134621.
%Y A134601 Sequence in context: A080062 A088949 A134600 this_sequence A134611 A134612 
               A025475
%Y A134601 Adjacent sequences: A134598 A134599 A134600 this_sequence A134602 A134603 
               A134604
%K A134601 nonn
%O A134601 1,2
%A A134601 Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Nov 11 2007

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