A013733 a(n) = 3^(3n+2).

9, 243, 6561, 177147, 4782969, 129140163, 3486784401, 94143178827, 2541865828329, 68630377364883, 1853020188851841, 50031545098999707, 1350851717672992089, 36472996377170786403, 984770902183611232881, 26588814358957503287787

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Comments

Additive digital root of a(n) is equal to 9. - Miquel Cerda, Oct 31 2016

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 (27).

Crossrefs

Cf. A013731, A013732, A013735, A013737.

Programs

Magma

[3^(3*n+2): n in [0..25]]; // Vincenzo Librandi, May 25 2011

Maple

seq(3^(3*n+2),n=0..15); # Nathaniel Johnston, Jun 26 2011

Mathematica

Table[3^(3n+2), {n,0,100}] (* Wesley Ivan Hurt, Oct 24 2013 *)

PARI

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

Formula

a(n)=27*a(n-1), n>0 ; a(0)=9 . G.f.: 9/(1-27*x). - Philippe Deléham, Nov 25 2008