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A042887 Denominators of continued fraction convergents to sqrt(975). 2
1, 4, 9, 40, 2489, 9996, 22481, 99920, 6217521, 24970004, 56157529, 249600120, 15531364969, 62375059996, 140281484961, 623500999840, 38797343475041, 155812874900004, 350423093275049, 1557505248000200, 96915748469287449, 389220499125149996, 875356746719587441 (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 (0,0,0,2498,0,0,0,-1).

FORMULA

G.f.: -(x^2-4*x-1)*(x^4+10*x^2+1) / ((x^4-50*x^2+1)*(x^4+50*x^2+1)). - Colin Barker, Dec 25 2013

MATHEMATICA

Denominator[Convergents[Sqrt[975], 30]] (* Vincenzo Librandi, Jan 31 2014 *)

CROSSREFS

Cf. A042886, A040943.

Sequence in context: A085110 A013459 A041229 * A053908 A149165 A083859

Adjacent sequences:  A042884 A042885 A042886 * A042888 A042889 A042890

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Colin Barker, Dec 25 2013

STATUS

approved

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Last modified March 25 03:50 EDT 2019. Contains 321450 sequences. (Running on oeis4.)