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 A071928 Kolakoski-(2,4) sequence: a(n) is length of n-th run. 6
 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 (list; graph; refs; listen; history; text; internal format)
 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 * A165207 A130501 A049116 Adjacent sequences:  A071925 A071926 A071927 * A071929 A071930 A071931 KEYWORD nonn,easy AUTHOR EXTENSIONS More terms from Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Sep 08 2002 STATUS approved

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Last modified February 20 06:26 EST 2019. Contains 320332 sequences. (Running on oeis4.)