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A269349
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Kolakoski-(1,7) sequence: a(n) is length of n-th run.
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2
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1, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 7, 7, 7, 7, 7, 7, 7, 1, 7, 1, 7, 1, 7, 1, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 7, 7
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OFFSET
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1,2
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COMMENTS
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17, 1777, 1777777711111117777777 are primes.
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LINKS
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MATHEMATICA
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seed = {1, 7}; w = {}; i = 1; Do[w = Join[w, Array[seed[[Mod[i - 1, Length[seed]] + 1]]&, If[i > Length[w], seed, w][[i]]]]; i++, {n, 42}]; w
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CROSSREFS
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Cf. similar sequences listed in A269268.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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