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 A107604 Order of appearance of twos in the Fibonacci substitution :triangular in form. 0
 2, 2, 2, 2, 5, 2, 5, 2, 5, 7, 2, 5, 7, 2, 5, 7, 2, 5, 7, 10, 2, 5, 7, 10, 2, 5, 7, 10, 2, 5, 7, 10, 13, 2, 5, 7, 10, 13, 2, 5, 7, 10, 13, 15, 2, 5, 7, 10, 13, 15, 2, 5, 7, 10, 13, 15, 2, 5, 7, 10, 13, 15, 18, 2, 5, 7, 10, 13, 15, 18, 2, 5, 7, 10, 13, 15, 18, 20 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Fibonacci substitutions contain thrre types of informstion: 1) length 2) count of ones and twos 3) order of appearance of ones and twos LINKS FORMULA 1->{1, 2}, 2->{1} EXAMPLE {} 2, 2, 2, 2,5, 2,5, 2,5,7, 2,5,7, 2,5,7, 2,5,7,10, 2,5,7,10, 2,5,7,10, 2,5,7,10,13 MATHEMATICA s[1] = {1, 2}; s[2] = {1};; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] a = Table[Flatten[Table[If[p[i][[j]] == 2, j, {}], {j, 1, i}]], {i, 1, 20}] CROSSREFS Cf. A000045. Sequence in context: A154097 A221491 A224254 * A080647 A324516 A181058 Adjacent sequences:  A107601 A107602 A107603 * A107605 A107606 A107607 KEYWORD nonn,uned,tabl AUTHOR Roger L. Bagula, Jun 09 2005 STATUS approved

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Last modified June 2 11:35 EDT 2020. Contains 334771 sequences. (Running on oeis4.)