%I #16 Mar 19 2017 10:28:32
%S 1,2,5,7,12,19,31,81,193,10117,20427,50971,71398,122369,193767,316136,
%T 826039,1968214,103173167,208314548,519802263,728116811,1247919074,
%U 1976035885,3223954959,8423945803,20071846565,1052159967183,2124391780931,5300943529045
%N Denominators of continued fraction convergents to sqrt(698).
%H Vincenzo Librandi, <a href="/A042343/b042343.txt">Table of n, a(n) for n = 0..200</a>
%H <a href="/index/Rec#order_18">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 10198, 0, 0, 0, 0, 0, 0, 0, 0, 1).
%F G.f.: -(x^16 -2*x^15 +5*x^14 -7*x^13 +12*x^12 -19*x^11 +31*x^10 -81*x^9 +193*x^8 +81*x^7 +31*x^6 +19*x^5 +12*x^4 +7*x^3 +5*x^2 +2*x +1) / (x^18 +10198*x^9 -1). - _Colin Barker_, Dec 09 2013
%t Denominator[Convergents[Sqrt[698], 30]] (* _Vincenzo Librandi_, Jan 20 2014 *)
%Y Cf. A042342, A040671.
%K nonn,frac,easy
%O 0,2
%A _N. J. A. Sloane_.
%E More terms from _Colin Barker_, Dec 09 2013