This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 9 19:51 EST 2019. Contains 329879 sequences. (Running on oeis4.)