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Search: id:A107790
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| A107790 |
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Ones order in the tribonacci substitution of three symbols. |
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+0
1
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| 3, 7, 12, 15, 20, 24, 29, 33, 38, 41, 46, 50, 55, 60, 64, 69, 72, 77, 81, 86, 89, 94, 98, 103, 108, 112, 117, 120, 125, 129, 134, 138, 143, 146, 151, 155, 160, 165, 169, 174, 177, 182, 186, 191, 195, 200, 203, 208, 212, 217, 222, 226, 231, 234, 239, 243, 248, 251
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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1->(2), 2->{3}, 3->{1, 2, 3}, a(n) = order of appearance of ones in the substitution
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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]] pp = p[13] a = Flatten[Table[If[pp[[j]] == 1, j, {}], {j, 1, Length[pp]}]]
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CROSSREFS
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Cf. A000045, A000213.
Adjacent sequences: A107787 A107788 A107789 this_sequence A107791 A107792 A107793
Sequence in context: A062731 A083031 A022805 this_sequence A075895 A033015 A096998
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 11 2005
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