%I #28 May 26 2024 01:40:26

%S 3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,

%T 10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,3,10,

%U 3,10,3,10,3,10,3,10,3,10,3,10

%N Period 2: repeat [3,10].

%C Continued fraction expansion of A176109.

%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 + 13/2. - _Paolo P. Lava_, Oct 20 2006

%F G.f. (3+10x)/((1-x)*(1+x)). - _R. J. Mathar_, Nov 21 2011

%F a(n+2) = a(n). - _Wesley Ivan Hurt_, May 26 2024

%t PadRight[{},100,{3,10}] (* _Harvey P. Dale_, Oct 31 2015 *)

%o (PARI) a(n)=3+n%2*7 \\ _Charles R Greathouse IV_, Dec 21 2011

%Y Cf. A176109.

%K nonn,easy

%O 0,1

%A _N. J. A. Sloane_