Search: id:A067003
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%I A067003
%S A067003 1,1,2,3,4,1,5,6,7,2,8,3,9,4,5,10,11,6,12,7,8,9,13,10,14,11,15,12,16,1,
%T A067003 17,18,13,14,15,16,19,17,18,19,20,2,21,20,21,22,22,23,23,24,25,26,24,
%U A067003 27,28,29,30,31,25,3,26,32,33,27,34,4,28,35,36,5,29,37,30,38,39,40,41
%N A067003 Number of numbers <= n with same number of distinct prime factors as 
               n.
%F A067003 a(A002110(n))=1.
%e A067003 a(11)=8 since 2,3,4,5,7,8,9,11 each have one distinct prime factor. a(12)=3 
               since 6,10,12 each have two distinct prime factors.
%Y A067003 Cf. A001221, A008479, A058933, A067004. Inverse of A000961, A007774, 
               A033992, A033993, A051270 etc.
%Y A067003 Sequence in context: A133108 A055441 A104717 this_sequence A117386 A101174 
               A050144
%Y A067003 Adjacent sequences: A067000 A067001 A067002 this_sequence A067004 A067005 
               A067006
%K A067003 nonn
%O A067003 1,3
%A A067003 Henry Bottomley (se16(AT)btinternet.com), Dec 21 2001

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