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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.

A187833 Rank transform of the sequence floor(3n/2-1/2); complement of A187834.

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%I A187833 #6 Dec 04 2016 19:46:25
%S A187833 1,3,5,6,9,10,12,14,16,17,19,21,23,25,27,28,30,32,34,36,38,39,41,43,
%T A187833 45,46,49,50,52,54,56,58,59,61,63,65,67,68,70,72,74,76,78,79,81,83,85,
%U A187833 87,89,90,92,94,96,98,100,101,103,105,107,108,111,112,114,116,118,119,121,123,125,127,129,130,133,134,136,138,140,141,143,145,147,149
%N A187833 Rank transform of the sequence floor(3n/2-1/2); complement of A187834.
%C A187833 A187833 is the rank transform of the sequence A001631 of positive integers not divisible by 3.  For a discussion of rank transforms, see A187224.
%t A187833 seqA = Table[Floor[3n/2-1/2], {n, 1, 220}]
%t A187833 seqB = Table[n, {n, 1, 220}];(*A000027*)
%t A187833 jointRank[{seqA_,
%t A187833    seqB_}] := {Flatten@Position[#1, {_, 1}],
%t A187833     Flatten@Position[#1, {_, 2}]} &[
%t A187833   Sort@Flatten[{{#1, 1} & /@ seqA, {#1, 2} & /@ seqB}, 1]];
%t A187833 limseqU =
%t A187833  FixedPoint[jointRank[{seqA, #1[[1]]}] &,
%t A187833    jointRank[{seqA, seqB}]][[1]] (*A187833*)
%t A187833 Complement[Range[Length[seqA]], limseqU]  (*A187834*)
%t A187833 (*by _Peter J. C. Moses_, Mar 13 2011*)
%Y A187833 Cf. A187224, A187834.
%K A187833 nonn
%O A187833 1,2
%A A187833 _Clark Kimberling_, Mar 13 2011