Search: id:A048640
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%I A048640
%S A048640 1,2,4,8,6,16,10,32,64,18,12,128,256,20,34,512,66,1024,14,2048,36,130,
%T A048640 24,4096,258,68,8192,22,16384,514,32768,132,65536,40,260,1026,131072,
%U A048640 262144,2050,72,38,524288,516,26,1048576,2097152,4098,48,70,4194304
%N A048640 Binary encoding of A005117.
%F A048640 a(n) = 2^i1+2^i2+...+2^iz, where A005117[ n ] = p_i1*p_i2*p_i3*...*p_iz 
               (p_i stands for the i-th prime, where the first prime is 2).
%e A048640 10 = 2*5 = p_1*p_3 -> 2^1+2^3 = 2+8 = 10.
%Y A048640 Cf. A048639.
%Y A048640 Sequence in context: A151732 A109554 A140692 this_sequence A124510 A131886 
               A061284
%Y A048640 Adjacent sequences: A048637 A048638 A048639 this_sequence A048641 A048642 
               A048643
%K A048640 nonn
%O A048640 1,2
%A A048640 Antti Karttunen, Jul 14 1999

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