%I #21 Feb 21 2018 15:02:39
%S 1,8,9,26,139,304,1659,3622,5281,45870,2390521,19170038,21560559,
%T 62291156,333016339,728323834,3974635509,8677594852,12652230361,
%U 109895437740,5727214992841,45927615380468,51654830373309,149237276127086,797841211008739,1744919698144564
%N Denominators of continued fraction convergents to sqrt(682).
%H Vincenzo Librandi, <a href="/A042311/b042311.txt">Table of n, a(n) for n = 0..200</a>
%H <a href="/index/Rec#order_20">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,0,2395802,0,0,0,0,0,0,0,0,0,-1).
%F G.f.: -(x^18 -8*x^17 +9*x^16 -26*x^15 +139*x^14 -304*x^13 +1659*x^12 -3622*x^11 +5281*x^10 -45870*x^9 -5281*x^8 -3622*x^7 -1659*x^6 -304*x^5 -139*x^4 -26*x^3 -9*x^2 -8*x -1) / (x^20 -2395802*x^10 +1). - _Colin Barker_, Dec 07 2013
%F a(n) = 2395802*a(n-10) - a(n-20) for n>19. - _Vincenzo Librandi_, Jan 20 2014
%t Denominator[Convergents[Sqrt[682], 30]] (* _Harvey P. Dale_, Dec 29 2013 *)
%Y Cf. A042310, A040655.
%K nonn,frac,easy
%O 0,2
%A _N. J. A. Sloane_
%E More terms from _Colin Barker_, Dec 07 2013
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