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A010699 Period 2: repeat (2,9). 3

%I #27 Dec 14 2023 06:06:36

%S 2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,

%T 2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,2,9,

%U 2,9,2,9,2,9,2,9,2,9,2,9,2

%N Period 2: repeat (2,9).

%C Continued fraction of 1 + sqrt(11)/3 = A176056. - _R. J. Mathar_, Nov 21 2011

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).

%F a(n) = -7/2*(-1)^n+11/2. - _Paolo P. Lava_, Oct 20 2006

%F G.f.: (2+9x)/((1-x)(1+x)). - _R. J. Mathar_, Nov 21 2011

%F a(n) = 2 + 7*(n mod 2) = 2 + 7*A000035(n). - _M. F. Hasler_, Feb 26 2020

%t PadRight[{},100,{2,9}] (* _Harvey P. Dale_, Mar 25 2015 *)

%o (PARI) a(n)=n%2*7+2 \\ _Charles R Greathouse IV_, Jul 13 2016

%Y Equals 2 + A010678 = 2 + 7*A000035.

%K nonn,easy

%O 0,1

%A _N. J. A. Sloane_

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)