A071928 Kolakoski-(2,4) sequence: a(n) is length of n-th run.

2, 2, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 4, 4, 2, 2, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 4, 4, 2, 2, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 4, 4, 2, 2, 4, 4, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 2, 2, 4

Offset

1,1

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Michael Baake and Bernd Sing, Kolakoski-(3,1) is a (deformed) model set, arXiv:math/0206098 [math.MG], 2002-2003.

B. Sing, Kolakoski-(2m,2n) are limit-periodic model sets, arXiv:math-ph/0207037, 2002-2003.

Mathematica

seed = {2, 4}; w = {}; i = 1; Do[w = Join[w, Array[seed[[Mod[i - 1, Length[seed]] + 1]] &, If[i > Length[w], seed, w][[i]]]]; i++, {n, 36}]; w (* Ivan Neretin, Apr 02 2015 *)

Crossrefs

Cf. A000002, A071820, A071907, A064353, A071942.

Sequence in context: A119922 A097860 A098979 * A325445 A165207 A130501

Adjacent sequences: A071925 A071926 A071927 * A071929 A071930 A071931

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Sep 08 2002

Status

approved