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A173810
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(8*10^n-71)/9 for n>0.
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2
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1, 81, 881, 8881, 88881, 888881, 8888881, 88888881, 888888881, 8888888881, 88888888881, 888888888881, 8888888888881, 88888888888881, 888888888888881, 8888888888888881, 88888888888888881, 888888888888888881
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = 10*a(n-1)+71 with n>0, a(0)=-7.
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MAPLE
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MATHEMATICA
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CoefficientList[Series[(1+70*x)/((1-x)*(1-10*x)), {x, 0, 30}], x] (* Vincenzo Librandi, Jul 05 2012
LinearRecurrence[{11, -10}, {1, 81}, 30] (* Harvey P. Dale, Feb 20 2016 *)
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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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