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A180408
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Nonzero digits not used in n.
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0
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123456789, 23456789, 13456789, 12456789, 12356789, 12346789, 12345789, 12345689, 12345679, 12345678, 23456789, 23456789, 3456789, 2456789, 2356789, 2346789, 2345789, 2345689, 2345679, 2345678, 13456789, 3456789, 13456789, 1456789, 1356789, 1346789, 1345789
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 123456789 after removing any digits that appear in n. If n uses all digits, then a(n) = 0.
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EXAMPLE
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a(13) = 123456789 without 1 and 3 = 2456789.
a(123456789) = 0 (by definition).
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MATHEMATICA
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newn[n_]:=FromDigits[Complement[Range[9], IntegerDigits[n]]]; Table[newn[i], {i, 50}] (* Harvey P. Dale, Nov 21 2010 *)
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CROSSREFS
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KEYWORD
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easy,nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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