A173833 10^n - 3.

7, 97, 997, 9997, 99997, 999997, 9999997, 99999997, 999999997, 9999999997, 99999999997, 999999999997, 9999999999997, 99999999999997, 999999999999997, 9999999999999997, 99999999999999997, 999999999999999997

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)+27 with n>1, a(1)=7.

G.f.: x*(20*x+7)/((x-1)*(10*x-1)). [Colin Barker, Jan 24 2013]

Mathematica

LinearRecurrence[{11, -10}, {7, 97}, 20] (* Vincenzo Librandi, Feb 22 2012 *)

Prog

(PARI) a(n)=10^n-3 \\ Charles R Greathouse IV, Jan 11 2012

Crossrefs

Sequence in context: A068694 A158579 A003618 * A093172 A074110 A155644

Adjacent sequences: A173830 A173831 A173832 * A173834 A173835 A173836

Keyword

nonn,easy

Author

Vincenzo Librandi, Feb 26 2010

Status

approved