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A173736
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(10^n+35)/9 for n>0.
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1
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5, 15, 115, 1115, 11115, 111115, 1111115, 11111115, 111111115, 1111111115, 11111111115, 111111111115, 1111111111115, 11111111111115, 111111111111115, 1111111111111115, 11111111111111115, 111111111111111115
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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) = a(n-1)+10^(n-1) = 10*a(n-1)-35 with n>0, a(0)=4.
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MATHEMATICA
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CoefficientList[Series[(5-40*x)/((1-x)*(1-10*x)), {x, 0, 30}], x] (* Vincenzo Librandi, Jul 05 2012 *)
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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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