A175603 a(n) = 8*(10^n-5).

40, 760, 7960, 79960, 799960, 7999960, 79999960, 799999960, 7999999960, 79999999960, 799999999960, 7999999999960, 79999999999960, 799999999999960, 7999999999999960, 79999999999999960, 799999999999999960

Offset: 1

Author

Vincenzo Librandi Nov 15 2010

Keywords

• nonn
• easy
• less

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..100
• Index entries for linear recurrences with constant coefficients, signature (11,-10)

Crossrefs

Equals 40 * A067272.

Programs

Magma

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

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 *)

Formula

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