login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A107641 Order of appearance of threes in the tribonacci ( Rauzy type) substitution: triangular. 0
1, 3, 2, 1, 4, 3, 5, 2, 5, 6, 1, 4, 6, 3, 5, 8, 9, 2, 5, 6, 9, 1, 4, 6, 9, 3, 5, 8, 9, 12, 2, 5, 6, 9, 11, 1, 4, 6, 9, 12, 14, 3, 5, 8, 9, 12, 14, 2, 5, 6, 9, 11, 14, 1, 4, 6, 9, 12, 14, 17, 3, 5, 8, 9, 12, 14, 17, 2, 5, 6, 9, 11, 14, 17, 19, 1, 4, 6, 9, 12, 14, 17, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..82.

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]] == 3), j, {}], {j, 1, i}]], {i, 1, 20}] MatrixForm[a] b = Flatten[a]

CROSSREFS

Cf. A000073.

Sequence in context: A327467 A347832 A077427 * A299352 A127671 A271724

Adjacent sequences: A107638 A107639 A107640 * A107642 A107643 A107644

KEYWORD

nonn,uned

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 10 01:27 EST 2022. Contains 358711 sequences. (Running on oeis4.)