OFFSET
1,2
COMMENTS
MATHEMATICA
seqA = Table[2*Floor[(n-1)/2], {n, 1, 220}]
seqB = Table[n, {n, 1, 220}]; (*A000027*)
jointRank[{seqA_,
seqB_}] := {Flatten@Position[#1, {_, 1}],
Flatten@Position[#1, {_, 2}]} &[
Sort@Flatten[{{#1, 1} & /@ seqA, {#1, 2} & /@ seqB}, 1]];
limseqU =
FixedPoint[jointRank[{seqA, #1[[1]]}] &,
jointRank[{seqA, seqB}]][[1]] (*A187576*)
Complement[Range[Length[seqA]], limseqU] (*A187577*)
(*by Peter J. C. Moses, Mar 11 2011*)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Mar 11 2011
STATUS
approved