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A173812
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(8*10^n-17)/9 for n>0.
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2
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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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Vincenzo Librandi, Table of n, a(n) for n = 1..100
Index to sequences with linear recurrences with constant coefficients, signature (11,-10).
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FORMULA
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a(n) = 10*a(n-1)+17 with n>0, a(0)=-1.
a(n) = 11*a(n-1) -10*a(n-2). - Vincenzo Librandi, Jul 05 2012
G.f.: x*(7+10*x)/((1-x)*(1-10*x)). - Vincenzo Librandi, Jul 05 2012
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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 *)
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PROG
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(MAGMA) [(8*10^n-17)/9: n in [1..20]]; // Vincenzo Librandi, Jul 05 2012
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CROSSREFS
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Cf. A093171.
Sequence in context: A092586 A048363 A183613 * A199027 A020556 A007803
Adjacent sequences: A173809 A173810 A173811 * A173813 A173814 A173815
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Feb 25 2010
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STATUS
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approved
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