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A009299
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If a, b in sequence, so is a*b+2.
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4
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2, 6, 14, 30, 38, 62, 78, 86, 126, 158, 174, 182, 198, 230, 254, 318, 350, 366, 374, 398, 422, 462, 470, 510, 518, 534, 638, 702, 734, 750, 758, 798, 846, 870, 902, 926, 942, 950, 1022, 1038, 1046, 1070, 1094, 1142, 1190, 1206, 1278, 1382, 1406, 1446, 1470, 1502
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listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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PROG
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(Haskell)
import Data.Set (singleton, deleteFindMin, insert)
a009299 n = a009299_list !! (n-1)
a009299_list = f [2] (singleton 2) where
f xs s = m : f xs' (foldl (flip insert) s' (map ((+ 2) . (* m)) xs'))
where xs' = m : xs
(m, s') = deleteFindMin s
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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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