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Search: id:A107640
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| A107640 |
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Order of appearance of twos in the tribonacci ( Rauzy type) substitution: triangular. |
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+0
1
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| 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; listen)
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OFFSET
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0,2
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FORMULA
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1->{2}, 2->{3}, 3->{1, 2, 3}
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MATHEMATICA
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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]
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CROSSREFS
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Cf. A000073.
Sequence in context: A071046 A144334 A141210 this_sequence A030065 A055176 A118267
Adjacent sequences: A107637 A107638 A107639 this_sequence A107641 A107642 A107643
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KEYWORD
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nonn,uned,tabl
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 09 2005
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