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A042745 Denominators of continued fraction convergents to sqrt(903). 2
1, 20, 1201, 24040, 1443601, 28896060, 1735207201, 34733040080, 2085717612001, 41749085280100, 2507030834418001, 50182365773640120, 3013448977252825201, 60319161910830144140, 3622163163627061473601, 72503582434452059616160 (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 (0,1202,0,-1).

FORMULA

G.f.: -(x^2-20*x-1) / (x^4-1202*x^2+1). - Colin Barker, Dec 22 2013

MATHEMATICA

Denominator[Convergents[Sqrt[903], 30]] (* Vincenzo Librandi, Jan 28 2014 *)

LinearRecurrence[{0, 1202, 0, -1}, {1, 20, 1201, 24040}, 20] (* Harvey P. Dale, Oct 14 2019 *)

CROSSREFS

Cf. A042744, A040872.

Sequence in context: A151625 A203775 A184269 * A158912 A036067 A294191

Adjacent sequences:  A042742 A042743 A042744 * A042746 A042747 A042748

KEYWORD

nonn,frac,easy,less

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Additional term from Colin Barker, Dec 22 2013

STATUS

approved

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Last modified December 8 02:41 EST 2021. Contains 349590 sequences. (Running on oeis4.)