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A173806
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a(n) = (7*10^n-61)/9 for n>0.
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2
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1, 71, 771, 7771, 77771, 777771, 7777771, 77777771, 777777771, 7777777771, 77777777771, 777777777771, 7777777777771, 77777777777771, 777777777777771, 7777777777777771, 77777777777777771, 777777777777777771
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OFFSET
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1,2
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..100
Index entries for linear recurrences with constant coefficients, signature (11,-10).
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FORMULA
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a(n) = 10*a(n-1)+61 with n>0, a(0)=-6.
G.f.: x*(1+60*x)/((1-x)*(1-10*x)). - Vincenzo Librandi, Jul 05 2012
a(n) = 11*a(n-1) -10*a(n-2). - Vincenzo Librandi, Jul 05 2012
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MATHEMATICA
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CoefficientList[Series[(1+60*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)[(7*10^n-61)/9: n in [1..20]]; // Vincenzo Librandi, Jul 05 2012
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CROSSREFS
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Cf. A093176.
Sequence in context: A351896 A089706 A220623 * A253683 A210699 A346023
Adjacent sequences: A173803 A173804 A173805 * A173807 A173808 A173809
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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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