A199216 6*5^n+1.

7, 31, 151, 751, 3751, 18751, 93751, 468751, 2343751, 11718751, 58593751, 292968751, 1464843751, 7324218751, 36621093751, 183105468751, 915527343751, 4577636718751, 22888183593751, 114440917968751, 572204589843751, 2861022949218751

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (6,-5).

Formula

a(n) = 5*a(n-1)-4.

a(n) = 6*a(n-1)-5*a(n-2).

G.f.: (7-11*x)/((1-x)*(1-5*x)).

Mathematica

6*5^Range[0, 30]+1 (* or *) LinearRecurrence[{6, -5}, {7, 31}, 30] (* Harvey P. Dale, May 14 2017 *)

Prog

(Magma) [6*5^n+1: n in [0..30]];

Crossrefs

Sequence in context: A086901 A003526 A121517 * A057620 A055625 A102239

Adjacent sequences: A199213 A199214 A199215 * A199217 A199218 A199219

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 05 2011

Status

approved