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A173812 (8*10^n-17)/9 for n>0. 3
7, 87, 887, 8887, 88887, 888887, 8888887, 88888887, 888888887, 8888888887, 88888888887, 888888888887, 8888888888887, 88888888888887, 888888888888887, 8888888888888887, 88888888888888887, 888888888888888887 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..100

Index entries for linear recurrences with constant coefficients, signature (11,-10).

FORMULA

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

MATHEMATICA

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 *)

PROG

(MAGMA) [(8*10^n-17)/9: n in [1..20]]; // Vincenzo Librandi, Jul 05 2012

CROSSREFS

Cf. A093171.

Sequence in context: A183613 A295036 A295527 * A199027 A279845 A231447

Adjacent sequences:  A173809 A173810 A173811 * A173813 A173814 A173815

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 25 2010

STATUS

approved

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Last modified April 7 15:56 EDT 2020. Contains 333306 sequences. (Running on oeis4.)