A041965 - OEIS

%I #13 Jun 13 2015 00:49:38

%S 1,2,17,36,1601,3238,27505,58248,2590417,5239082,44503073,94245228,

%T 4191293105,8476831438,72005944609,152488720656,6781509653473,

%U 13715508027602,116505573874289,246726655776180,10972478428026209,22191683511828598,188505946522654993

%N Denominators of continued fraction convergents to sqrt(505).

%H Vincenzo Librandi, <a href="/A041965/b041965.txt">Table of n, a(n) for n = 0..200</a>

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,1618,0,0,0,-1).

%F G.f.: -(x^2-2*x-1)*(x^4+18*x^2+1) / (x^8-1618*x^4+1). - _Colin Barker_, Nov 28 2013

%t Denominator[Convergents[Sqrt[505], 30]] (* _Vincenzo Librandi_, Dec 28 2013 *)

%Y Cf. A041964, A040482.

%K nonn,frac,easy

%O 0,2

%A _N. J. A. Sloane_.

%E More terms from _Colin Barker_, Nov 28 2013