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A107846
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Number of duplicate digits of n.
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1
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| a(n) = A055642(n) - A043537(n).
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EXAMPLE
| a(11) = 1 because 11 has two total decimal digits but only one distinct digit (1) and 2-1=1.
Similarly, a(3653135) = 7 (total digits) - 4 (distinct digits: 1,3,5,6) = 3 (There are three duplicate digits here, namely, 3, 3 and 5).
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CROSSREFS
| Cf. A055642 (Total decimal digits of n), A043537 (Distinct decimal digits of n).
Sequence in context: A088918 A011726 A070109 * A179801 A065202 A045701
Adjacent sequences: A107843 A107844 A107845 * A107847 A107848 A107849
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KEYWORD
| base,easy,nonn
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AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 24, 2005
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