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A010712 Period 2: repeat (4,7).

%I A010712 #42 Dec 14 2023 06:04:29
%S A010712 4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,
%T A010712 4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,4,7,
%U A010712 4,7,4,7,4,7,4,7,4,7,4,7,4
%N A010712 Period 2: repeat (4,7).
%C A010712 a(n) = A047892(n+1) mod 9. - _Reinhard Zumkeller_, Sep 23 2007
%C A010712 Continued fraction expansion of A176217. - _R. J. Mathar_, Mar 08 2012
%H A010712 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
%F A010712 a(n) = -(3/2)*(-1)^n + 11/2. - _Paolo P. Lava_, Oct 20 2006
%F A010712 a(n) = 3 + 4^(n mod 2). - _Reinhard Zumkeller_, Sep 23 2007
%F A010712 G.f.: (4+7x)/((1-x)(1+x)). - _R. J. Mathar_, Nov 21 2011
%F A010712 a(n) = 4 + 2^(1-(-1)^n) - 1. - _Vincenzo Librandi_, Feb 27 2020
%t A010712 PadRight[{},120,{4,7}] (* _Harvey P. Dale_, Nov 15 2012 *)
%o A010712 (PARI) a(n)=4+n%2*3 \\ _Charles R Greathouse IV_, Dec 21 2011
%o A010712 (Haskell)
%o A010712 a010712 = (+ 3) . (4 ^) . flip mod 2
%o A010712 a010712_list = cycle [4, 7]  -- _Reinhard Zumkeller_, Mar 19 2014
%o A010712 (Magma) &cat [[4, 7]^^50]; // _Vincenzo Librandi_, Feb 27 2020
%K A010712 nonn,easy
%O A010712 0,1
%A A010712 _N. J. A. Sloane_