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 A187484 #8 Dec 04 2016 19:46:24 %S A187484 1,2,3,4,6,7,9,10,12,13,15,16,17,18,20,21,23,24,25,26,28,29,31,32,33, %T A187484 34,36,37,39,40,41,42,44,45,47,48,50,51,53,54,55,56,58,59,61,62,63,64, %U A187484 66,67,69,70,72,73,75,76,77,78,80,81,83,84,85,86,88,89,91,92,94,95,97,98,99,100,102,103,105,106,107,108,110,111,113,114,116,117,119,120,121,122,124,125,127,128,129,130 %N A187484 Rank transform of the sequence A004526=(0,0,1,1,2,2,3,3,4,4,...); complement of A187475. %C A187484 See A187224 and A004526. %t A187484 seqA = Table[Floor[(n-1)/2], {n, 1, 180}] (* A004526 *) %t A187484 seqB = Table[n, {n, 1, 80}]; (* A000027 *) %t A187484 jointRank[{seqA_, seqB_}] := {Flatten@Position[#1, {_, 1}], %t A187484 Flatten@Position[#1, {_, 2}]} &[Sort@Flatten[{{#1, 1} & /@ seqA, %t A187484 {#1, 2} & /@ seqB}, 1]]; %t A187484 limseqU = FixedPoint[jointRank[{seqA, #1[[1]]}] &, jointRank[{seqA, seqB}]][[1]] (* A187484 *) %t A187484 Complement[Range[Length[seqA]], limseqU] (* A187475 *) %t A187484 (* by _Peter J. C. Moses_, Mar 10 2011 *) %Y A187484 Cf. A187422, A187485, A004526. %K A187484 nonn %O A187484 1,2 %A A187484 _Clark Kimberling_, Mar 10 2011