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 A187687 #5 Dec 04 2016 19:46:24 %S A187687 1,3,5,7,9,11,12,15,16,18,20,22,24,26,28,29,31,34,35,37,39,41,43,45, %T A187687 46,48,50,52,54,56,58,60,62,63,65,67,69,71,73,75,77,79,80,82,84,86,88, %U A187687 90,92,94,96,97,99,101,103,105,107,108,111,113,114,116,118,120,122,124,125,127,130,131,133,135,137,139,141,143,145,146,148,150,152 %N A187687 Rank transform of the sequence floor(5n/3); complement of A187688. %C A187687 See A187224. %t A187687 seqA = Table[Floor[5n/3], {n, 1, 220}] %t A187687 seqB = Table[n, {n, 1, 220}];(*A000027*) %t A187687 jointRank[{seqA_, %t A187687 seqB_}] := {Flatten@Position[#1, {_, 1}], %t A187687 Flatten@Position[#1, {_, 2}]} &[ %t A187687 Sort@Flatten[{{#1, 1} & /@ seqA, {#1, 2} & /@ seqB}, 1]]; %t A187687 limseqU = %t A187687 FixedPoint[jointRank[{seqA, #1[[1]]}] &, %t A187687 jointRank[{seqA, seqB}]][[1]] (*A187687*) %t A187687 Complement[Range[Length[seqA]], limseqU] (*A187688*) %t A187687 (*by _Peter J. C. Moses_, Mar 12 2011*) %Y A187687 Cf. A187224, A187688. %K A187687 nonn %O A187687 1,2 %A A187687 _Clark Kimberling_, Mar 12 2011