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 A041763 Denominators of continued fraction convergents to sqrt(402). 2
 1, 20, 801, 16040, 642401, 12864060, 515204801, 10316960080, 413193608001, 8274189120100, 331380758412001, 6635889357360120, 265766955052816801, 5321974990413696140, 213144766571600662401, 4268217306422426944160, 170941837023468678428801 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 Index entries for linear recurrences with constant coefficients, signature (0,802,0,-1). FORMULA G.f.: -(x^2-20*x-1) / (x^4-802*x^2+1). - Colin Barker, Nov 24 2013 sa(n) = 802*a(n-2) - a(n-4) for n>3. - Vincenzo Librandi, Dec 24 2013 MATHEMATICA Denominator[Convergents[Sqrt[402], 30]] (* Vincenzo Librandi, Dec 24 2013 *) LinearRecurrence[{0, 802, 0, -1}, {1, 20, 801, 16040}, 30] (* Harvey P. Dale, Oct 09 2017 *) PROG (MAGMA) I:=[1, 20, 801, 16040]; [n le 4 select I[n] else 802*Self(n-2)-Self(n-4): n in [1..40]]; // Vincenzo Librandi, Dec 24 2013 CROSSREFS Cf. A041762, A040381. Sequence in context: A002455 A267671 A281777 * A041760 A250550 A292417 Adjacent sequences:  A041760 A041761 A041762 * A041764 A041765 A041766 KEYWORD nonn,frac,easy,less AUTHOR EXTENSIONS a(16) from Colin Barker, Nov 24 2013 STATUS approved

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Last modified November 16 17:39 EST 2018. Contains 317275 sequences. (Running on oeis4.)