This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A182909 #10 Jun 25 2025 00:52:44
%S A182909 3,6,7,10,14,15,18,23,27,32,41,42,44,53,68,70,78,86,91,100,101,102,
%T A182909 103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,
%U A182909 120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142
%N A182909 Ranks of composite numbers when all prime powers p^n for n>=1 are jointly ranked.
%C A182909 The complement of A027883.
%e A182909 In the sequence A000961 (2,3,4,5,7,8,9,11,13,16,17,19,23,25,27,...) of prime powers p^n for n>=1, the composites 4,8,9,16,25,27,... occur with ranks 3,6,7,10,14,15...
%t A182909 T[i_,j_]:=Sum[Floor[j*Log[Prime[i]]/Log[Prime[h]]],{h,1,PrimePi[Prime[i]^j]}]; Complement[Range[200],Flatten[Table[T[i,j],{i,1,80},{j,1,1}]]]
%Y A182909 Cf. A000961, A024620, A027883.
%K A182909 nonn
%O A182909 1,1
%A A182909 _Clark Kimberling_, Dec 13 2010