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A143473
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Replace the leading digit d of n with 10-d (in decimal representation).
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2
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10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 30, 31
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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ld10[n_]:=Module[{idn=IntegerDigits[n]}, FromDigits[Join[{10-idn[[1]]}, Rest[ idn]]]]; Array[ld10, 100, 0] (* Harvey P. Dale, May 25 2020 *)
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PROG
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(Haskell)
a143473 n = foldl (\v d -> 10 * v + d) 0 $ (10 - z) : zs where
(z:zs) = map (read . return) $ show n
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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