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A179932
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Number of distinct positive integers that can be formed with the decimal digits of n.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 2, 4, 4, 2, 4, 4, 4, 4, 4, 4, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 4, 4, 4, 4, 2, 4, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 4, 2, 4, 4, 2, 4, 4, 4, 4, 4, 4, 4, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 4, 2, 3, 5, 10, 10
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OFFSET
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1,10
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LINKS
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EXAMPLE
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a(1) = 1 because there is only one number that can be formed with the digits in 1.
a(10) = 2 because the digits in 10 can be used to make 0, 1, 01, and 10, but only 1 and 10 are both nonzero and unique (obviously, 01=1).
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MATHEMATICA
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Table[Length[Union[FromDigits/@Flatten[Permutations/@Flatten[ Table[ Partition[ IntegerDigits[t], n, 1], {n, IntegerLength[t]}], 1], 1]/.(0-> Nothing)]], {t, 110}] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 21 2016 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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