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 A187474 #10 Apr 10 2021 23:57:17 %S A187474 1,3,4,6,8,9,11,13,15,16,18,19,21,22,25,26,28,30,31,33,35,36,38,40,41, %T A187474 43,44,46,48,50,51,53,55,56,58,60,62,63,65,67,68,70,72,73,75,77,78,80, %U A187474 81,84,85,87,88,90,91,93,95,97,98,100,102,103,105,107,109,110,112,113 %N A187474 Rank transform of the sequence floor(n*(Pi-2)); complement of A187475. %C A187474 See A187224. %t A187474 m = Pi-2; %t A187474 seqA = Table[Floor[m*n], {n, 1, 180}] (* A187320 *) %t A187474 seqB = Table[n, {n, 1, 80}]; (* A000027 *) %t A187474 jointRank[{seqA_, seqB_}] := {Flatten@Position[#1, {_, 1}], %t A187474 Flatten@Position[#1, {_, 2}]} &[Sort@Flatten[{{#1, 1} & /@ seqA, %t A187474 {#1, 2} & /@ seqB}, 1]]; %t A187474 limseqU = FixedPoint[jointRank[{seqA, #1[[1]]}] &, jointRank[{seqA, seqB}]][[1]] (* A187474 *) %t A187474 Complement[Range[Length[seqA]], limseqU] (* A187475 *) %t A187474 (* _Peter J. C. Moses_, Mar 10 2011 *) %Y A187474 Cf. A187224, A187475. %K A187474 nonn %O A187474 1,2 %A A187474 _Clark Kimberling_, Mar 10 2011