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A061217
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Number of zeros in the concatenation n(n-1)(n-2)(n-3)...321.
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0
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 11, 12, 13, 14
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,20
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EXAMPLE
| a(30) = 3 since number of zeros in 302928272625242322212019181716151413121110987654321 is 3.
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MATHEMATICA
| Table[Count[Flatten[IntegerDigits/@Table[x-n, {n, 0, x-1}]], 0], {x, 110}] (* From Harvey P. Dale, Aug 10 2011 *)
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CROSSREFS
| Sequence in context: A132272 A179051 A054899 * A102684 A156821 A025856
Adjacent sequences: A061214 A061215 A061216 * A061218 A061219 A061220
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KEYWORD
| nonn,base
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 22 2001
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EXTENSIONS
| Corrected and extended by Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 05 2001.
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