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A175603 a(n) = 8*(10^n-5). 1
40, 760, 7960, 79960, 799960, 7999960, 79999960, 799999960, 7999999960, 79999999960, 799999999960, 7999999999960, 79999999999960, 799999999999960, 7999999999999960, 79999999999999960, 799999999999999960 (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

G.f.: 40*x*(1+8*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011

MATHEMATICA

CoefficientList[Series[40 (1 + 8 x)/((10 x - 1) (x - 1)), {x, 0, 30}], x] (* Vincenzo Librandi, Oct 05 2014 *)

LinearRecurrence[{11, -10}, {40, 760}, 20] (* Harvey P. Dale, May 12 2022 *)

PROG

(Magma) [8*(10^n-5): n in [1..30]]; // Vincenzo Librandi, Oct 05 2014

CROSSREFS

Equals 40 * A067272.

Sequence in context: A160445 A010840 A233725 * A319308 A022073 A261571

Adjacent sequences:  A175600 A175601 A175602 * A175604 A175605 A175606

KEYWORD

nonn,easy,less

AUTHOR

Vincenzo Librandi Nov 15 2010

STATUS

approved

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Last modified September 25 22:56 EDT 2022. Contains 356986 sequences. (Running on oeis4.)