A013740 a(n) = 7^(3*n + 1).

7, 2401, 823543, 282475249, 96889010407, 33232930569601, 11398895185373143, 3909821048582988049, 1341068619663964900807, 459986536544739960976801, 157775382034845806615042743, 54116956037952111668959660849

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..100

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (343).

Formula

From Philippe Deléham, Nov 28 2008: (Start)

a(n) = 343*a(n-1); a(0)=7.

G.f.: 7/(1-343*x). (End)

Maple

seq(7^(3*n+1), n=0..11); # Nathaniel Johnston, Jun 26 2011

Mathematica

7^(3*Range[0, 20]+1) (* or *) NestList[343#&, 7, 20] (* Harvey P. Dale, Jan 21 2012 *)

Prog

(Magma) [7^(3*n+1): n in [0..15]]; // Vincenzo Librandi, May 25 2011
(PARI) a(n)=7^(3*n+1) \\ Charles R Greathouse IV, Jul 11 2016

Crossrefs

Cf. A013741.

Sequence in context: A216472 A065505 A067511 * A209591 A060759 A067504

Adjacent sequences: A013737 A013738 A013739 * A013741 A013742 A013743

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved