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A107018
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Belgian-7 numbers.
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13
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7, 10, 11, 21, 27, 29, 31, 32, 37, 41, 56, 70, 71, 77, 85, 94, 100, 101, 103, 106, 110, 111, 112, 113, 117, 118, 119, 122, 127, 128, 131, 133, 143, 152, 173, 176, 201, 205
(list;
graph;
refs;
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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MATHEMATICA
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belgianQ[n_, k_] := If[n < k, False, Block[{id = Join[{0}, IntegerDigits@ n]}, MemberQ[ Accumulate@ id, Mod[n - k, Plus @@ id]] ]]; Select[ Range@ 206, belgianQ[#, 7] &] (* Robert G. Wilson v, May 06 2011 *)
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PROG
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(Haskell)
a107018 n = a107018_list !! (n-1)
a107018_list = filter belge7 [7..] where
belge7 x = x == (head $ dropWhile (< x) $
scanl (+) 7 $ cycle (map (read . return) $ show x))
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CROSSREFS
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See A106039 for definition and link.
Belgian-k numbers, k=0..9: A106039, A106439, A106518, A106596, A106631, A106792, A107014, A107018, A107032, A107043.
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KEYWORD
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base,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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