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A042641 Denominators of continued fraction convergents to sqrt(850). 2
1, 6, 13, 84, 4885, 29394, 63673, 411432, 23926729, 143971806, 311870341, 2015193852, 117193113757, 705173876394, 1527540866545, 9870419075664, 574011847255057, 3453941502606006, 7481894852467069, 48345310617408420, 2811509910662155429 (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, 0, 0, 4898, 0, 0, 0, -1).

FORMULA

G.f.: -(x^2-6*x-1)*(x^4+14*x^2+1) / ((x^4-70*x^2+1)*(x^4+70*x^2+1)). - Colin Barker, Dec 20 2013

MATHEMATICA

Denominator[Convergents[Sqrt[850], 30]] (* Vincenzo Librandi, Jan 26 2014 *)

CROSSREFS

Cf. A042640, A040820.

Sequence in context: A041305 A215755 A144535 * A292121 A236250 A042285

Adjacent sequences:  A042638 A042639 A042640 * A042642 A042643 A042644

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Colin Barker, Dec 20 2013

STATUS

approved

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)