A013827 a(n) = 3^(5*n + 2).

9, 2187, 531441, 129140163, 31381059609, 7625597484987, 1853020188851841, 450283905890997363, 109418989131512359209, 26588814358957503287787, 6461081889226673298932241, 1570042899082081611640534563

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

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 (243).

Crossrefs

Cf. A000244 (3^n), A016873 (5*n+2).

Programs

Magma

[3^(5*n+2): n in [0..15]]; // Vincenzo Librandi, Jul 07 2011

Mathematica

3^(5*Range[0,20]+2) (* or *) NestList[243#&,9,20] (* Harvey P. Dale, Feb 05 2020 *)

PARI

a(n)=3^(5*n+2) \\ Charles R Greathouse IV, Jul 11 2016

Formula

From Philippe Deléham, Nov 26 2008: (Start)

a(n) = 243*a(n-1), n > 0; a(0)=9.

G.f.: 9/(1-243*x).

a(n) = 3*A013826(n). (End)