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A047846
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Number of successive odd nonprimes (A014076).
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6
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1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1, 2, 1, 2, 3, 1, 1, 1, 6, 1, 2, 4, 2, 2, 1, 2, 2, 4, 1, 5, 5, 1, 1, 2, 4, 2, 2, 2, 2, 1, 4, 6, 1, 1, 6, 2, 4, 1, 2, 3, 2, 2, 1, 2, 3, 1, 3, 4, 4, 2, 1, 2, 3, 1, 1, 5, 3, 1, 3, 1, 2, 5, 8, 2, 4, 2, 2, 2, 4, 2, 2, 2, 2, 1, 5
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OFFSET
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1,5
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COMMENTS
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Beginning with a(2), length of n-th run of identical numbers in A160522 [Kyle Stern, Jun 19 2009]
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LINKS
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MATHEMATICA
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Length /@ Split[Select[Range[1, 629, 2], PrimeOmega[#] != 1 &], #2 - #1 <= 2 &] (* Jayanta Basu, Aug 11 2013 *)
Length/@Select[Split[Table[If[PrimeQ[n], 0, 1], {n, 1, 701, 2}]], #[[1]]==1&] (* Harvey P. Dale, Oct 10 2023 *)
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PROG
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(Haskell)
a047846 n = a047846_list !! (n-1)
a047846_list = 1 : zipWith (-) (tail a196277_list) a196277_list
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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