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A030530
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n appears A070939(n) times.
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6
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0, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 21, 21, 21
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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FORMULA
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Sum_{n>=1} (-1)^(n+1)/a(n) = Sum_{n>=1} (-1)^(n+1)/A053738(n) = 0.90457767... . - Amiram Eldar, Feb 18 2024
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MATHEMATICA
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Join[{0}, Table[Table[n, IntegerLength[n, 2]], {n, 30}]]//Flatten (* Harvey P. Dale, Oct 20 2016 *)
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PROG
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(Haskell)
import Data.List (unfoldr)
a030530 n = a030530_list !! (n-1)
a030530_list = 0 : concatMap (\n -> unfoldr
(\x -> if x == 0 then Nothing else Just (n, div x 2)) n) [1..]
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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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STATUS
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approved
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