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 A041821 Denominators of continued fraction convergents to sqrt(431). 2

%I

%S 1,1,4,21,25,71,522,593,11789,12382,98463,209308,307771,1748163,

%T 5552260,7300423,297569180,304869603,1212177989,6365759548,7577937537,

%U 21521634622,158229379891,179751014513,3573498655638,3753249670151,29846246346695,63445742363541

%N Denominators of continued fraction convergents to sqrt(431).

%H Harvey P. Dale, <a href="/A041821/b041821.txt">Table of n, a(n) for n = 0..1000</a>

%H <a href="/index/Rec#order_32">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 303121440, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).

%F a7n) = 303121440*a(n-16)- a(n-32) for n>31. - _Vincenzo Librandi_, Dec 25 2013

%t Denominator[Convergents[Sqrt[431],50]] (* _Harvey P. Dale_, Jun 04 2012 *)

%Y Cf. A041820.

%K nonn,frac,easy

%O 0,3

%A _N. J. A. Sloane_.

%E More terms from _Vincenzo Librandi_, Dec 25 2013

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Last modified February 7 06:02 EST 2023. Contains 360112 sequences. (Running on oeis4.)