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A066246
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0 unless n is a composite number A002808(k) when a(n) = k.
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16
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0, 0, 0, 1, 0, 2, 0, 3, 4, 5, 0, 6, 0, 7, 8, 9, 0, 10, 0, 11, 12, 13, 0, 14, 15, 16, 17, 18, 0, 19, 0, 20, 21, 22, 23, 24, 0, 25, 26, 27, 0, 28, 0, 29, 30, 31, 0, 32, 33, 34, 35, 36, 0, 37, 38, 39, 40, 41, 0, 42, 0, 43, 44, 45, 46, 47, 0, 48, 49, 50, 0, 51, 0, 52, 53, 54, 55, 56, 0, 57
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OFFSET
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1,6
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COMMENTS
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LINKS
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MATHEMATICA
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Module[{k=1}, Table[If[CompositeQ[n], k; k++, 0], {n, 100}]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 03 2019 *)
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PROG
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(Haskell)
import Data.List (unfoldr, genericIndex)
a066246 n = genericIndex a066246_list (n - 1)
a066246_list = unfoldr x (1, 1, a002808_list) where
x (i, z, cs'@(c:cs)) | i == c = Just (z, (i + 1, z + 1, cs))
| i /= c = Just (0, (i + 1, z, cs'))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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