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 A107640 Order of appearance of twos in the tribonacci ( Rauzy type) substitution: triangular. 0
 1, 2, 1, 4, 3, 5, 2, 4, 1, 4, 3, 5, 8, 2, 4, 7, 1, 4, 8, 10, 3, 5, 8, 11, 2, 4, 7, 11, 1, 4, 8, 10, 13, 3, 5, 8, 11, 13, 2, 4, 7, 11, 13, 1, 4, 8, 10, 13, 16, 3, 5, 8, 11, 13, 16, 2, 4, 7, 11, 13, 16, 18, 1, 4, 8, 10, 13, 16, 18, 3, 5, 8, 11, 13, 16, 20 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA 1->{2}, 2->{3}, 3->{1, 2, 3} MATHEMATICA s[1] = {2}; s[2] = {3};; s[3] = {1, 2, 3}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] a = Table[Flatten[Table[If[(Length[p[i]]) >= j && (p[i][[j]] == 2), j, {}], {j, 1, i}]], {i, 1, 20}] MatrixForm[a] b = Flatten[a] CROSSREFS Cf. A000073. Sequence in context: A144334 A141210 A244373 * A030065 A328676 A269595 Adjacent sequences:  A107637 A107638 A107639 * A107641 A107642 A107643 KEYWORD nonn,uned,tabl AUTHOR Roger L. Bagula, Jun 09 2005 STATUS approved

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Last modified September 25 22:38 EDT 2020. Contains 337346 sequences. (Running on oeis4.)