A074803 Kolakoski-(4,2) sequence: a(n) is length of n-th run.

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

Mathematica

seed = {4, 2}; w = {}; i = 1; Do[w = Join[w, Array[seed[[Mod[i - 1, Length[seed]] + 1]] &, If[i > Length[w], seed, w][[i]]]]; i++, {n, 35}]; w (* Ivan Neretin, Apr 02 2015 *)

Crossrefs

Cf. A000002.

Sequence in context: A190338 A199177 A320086 * A177229 A046595 A046587

Adjacent sequences: A074800 A074801 A074802 * A074804 A074805 A074806

Keyword

nonn

Author

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

Status

approved