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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A107641 Order of appearance of threes in the tribonacci ( Rauzy type) substitution: triangular. 0

%I #4 Mar 30 2012 17:34:15

%S 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,

%T 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,

%U 9,12,14,17,2,5,6,9,11,14,17,19,1,4,6,9,12,14,17,18

%N Order of appearance of threes in the tribonacci ( Rauzy type) substitution: triangular.

%F 1->{2}, 2->{3}, 3->{1, 2, 3}

%t 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]

%Y Cf. A000073.

%K nonn,uned

%O 0,2

%A _Roger L. Bagula_, Jun 09 2005

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 March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)