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A173812
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(8*10^n-17)/9 for n>0.
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3
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7, 87, 887, 8887, 88887, 888887, 8888887, 88888887, 888888887, 8888888887, 88888888887, 888888888887, 8888888888887, 88888888888887, 888888888888887, 8888888888888887, 88888888888888887, 888888888888888887
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = 10*a(n-1)+17 with n>0, a(0)=-1.
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MATHEMATICA
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CoefficientList[Series[(7+10*x)/((1-x)*(1-10*x)), {x, 0, 30}], x] (* Vincenzo Librandi, Jul 05 2012 *)
Table[FromDigits[PadLeft[{7}, n, 8]], {n, 20}] (* Harvey P. Dale, Jun 22 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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