A175775 7*(10^n-3).

49, 679, 6979, 69979, 699979, 6999979, 69999979, 699999979, 6999999979, 69999999979, 699999999979, 6999999999979, 69999999999979, 699999999999979, 6999999999999979, 69999999999999979, 699999999999999979

Offset

1,1

Links

Table of n, a(n) for n=1..17.

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

Formula

a(1)=49, a(2)=679, a(n)=11*a(n-1)-10*a(n-2). - Harvey P. Dale, Jun 21 2011

G.f.: x*(7*(7+20*x))/(1-11*x+10*x^2). - Harvey P. Dale, Jun 21 2011

Mathematica

7(10^Range[20]-3) (* or *) LinearRecurrence[{11, -10}, {49, 679}, 20] (* Harvey P. Dale, Jun 21 2011 *)

Crossrefs

Sequence in context: A263704 A166832 A299711 * A215117 A350982 A289992

Adjacent sequences: A175772 A175773 A175774 * A175776 A175777 A175778

Keyword

nonn

Author

Vincenzo Librandi, Nov 15 2010

Status

approved