A010725 Period 2: repeat (6,9).

6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Index entries for linear recurrences with constant coefficients, signature (0,1).

Crossrefs

Cf. A176402.

Programs

Magma

&cat [[6, 9]^^50]; // Vincenzo Librandi, Feb 27 2020

Mathematica

Table[6 + 3 Mod[n, 2], {n, 0, 50}] (* Jinyuan Wang, Feb 26 2020 *)
PadRight[{},100,{6,9}] (* Harvey P. Dale, Jun 03 2025 *)

PARI

a(n)=6+n%2*3 \\ Charles R Greathouse IV, Dec 21 2011

Formula

a(n) = -(3/2)*(-1)^n + 15/2. - Paolo P. Lava, Oct 27 2006

G.f.: ( -6-9*x ) / ( (x-1)*(1+x) ). - R. J. Mathar, Nov 21 2011

a(n) = 6 + 2^(1-(-1)^n) - 1. - Vincenzo Librandi, Feb 27 2020