A013787 a(n) = 7^(4*n + 3).

343, 823543, 1977326743, 4747561509943, 11398895185373143, 27368747340080916343, 65712362363534280139543, 157775382034845806615042743, 378818692265664781682717625943, 909543680129861140820205019889143, 2183814375991796599109312252753832343

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (2401).

Formula

From Philippe Deléham, Dec 02 2008: (Start)

a(n) = 2401*a(n-1); a(0)=343.

G.f.: 343/(1-2401*x).

a(n) = 49*A013786(n). (End)

Mathematica

7^(4*Range[0, 10]+3) (* or *) NestList[2401#&, 343, 10] (* Harvey P. Dale, Sep 09 2021 *)

Prog

(Magma) [7^(4*n+3): n in [0..15]]; // Vincenzo Librandi, Jun 28 2011
(Maxima) makelist(7^(4*n+3), n, 0, 20); /* Martin Ettl, Oct 21 2012 */
(PARI) a(n)=7^(4*n+3) \\ Charles R Greathouse IV, Jul 11 2016

Crossrefs

Sequence in context: A046236 A294663 A222460 * A013844 A013306 A044878

Adjacent sequences: A013784 A013785 A013786 * A013788 A013789 A013790

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved