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 A187478 #8 Dec 26 2023 10:11:49 %S A187478 1,2,3,6,8,9,11,13,15,17,18,20,22,24,26,28,29,31,33,35,36,39,40,42,44, %T A187478 46,48,49,51,53,55,57,58,60,62,64,66,68,69,71,73,75,77,79,80,82,84,86, %U A187478 88,90,91,93,95,97,98,101,102,104,106,108,109,111,113,115,117,119,120 %N A187478 Rank transform of the sequence floor(3(n-2)/2); complement of A187479. %C A187478 See A187224. Although the first term of floor(3(n-2)/2) is negative, we can replace it by 0 without affecting the same joint rankings; thus, the procedure described at A187224 applies. %t A187478 seqA = Table[Floor[3(n-2)/2], {n, 1, 180}] %t A187478 seqB = Table[n, {n, 1, 80}]; (* A000027 *) %t A187478 jointRank[{seqA_, seqB_}] := {Flatten@Position[#1, {_, 1}], %t A187478 Flatten@Position[#1, {_, 2}]} &[Sort@Flatten[{{#1, 1} & /@ seqA, %t A187478 {#1, 2} & /@ seqB}, 1]]; %t A187478 limseqU = FixedPoint[jointRank[{seqA, #1[[1]]}] &, jointRank[{seqA, seqB}]][[1]] (* A187478 *) %t A187478 Complement[Range[Length[seqA]], limseqU] (* A187479 *) %t A187478 (* by _Peter J. C. Moses_, Mar 10 2011 *) %Y A187478 Cf. A187422, A187476, A187479. %K A187478 nonn %O A187478 1,2 %A A187478 _Clark Kimberling_, Mar 10 2011