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A165247
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a(n) = (10^n + 71)/9.
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3
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9, 19, 119, 1119, 11119, 111119, 1111119, 11111119, 111111119, 1111111119, 11111111119, 111111111119, 1111111111119, 11111111111119, 111111111111119, 1111111111111119, 11111111111111119
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OFFSET
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1,1
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COMMENTS
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Also n - 1 ones followed by a nine.
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LINKS
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FORMULA
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MATHEMATICA
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Table[FromDigits[PadLeft[{9}, n, 1]], {n, 20}] (* Harvey P. Dale, Apr 25 2014 *)
CoefficientList[Series[(9 - 80 x)/((1 - x) (1 - 10 x)), {x, 0, 30}], x] (* Vincenzo Librandi, Apr 26 2014 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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