A042769 Denominators of continued fraction convergents to sqrt(915).

1, 4, 241, 968, 58321, 234252, 14113441, 56688016, 3415394401, 13718265620, 826511331601, 3319763592024, 200012326853041, 803369071004188, 48402156587104321, 194411995419421472, 11713121881752392641, 47046899522428992036, 2834527093227491914801

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, 242, 0, -1).

Formula

G.f.: -(x^2-4*x-1) / (x^4-242*x^2+1). - Colin Barker, Dec 23 2013

Mathematica

Denominator[Convergents[Sqrt[915], 30]] (* Vincenzo Librandi, Jan 28 2014 *)
LinearRecurrence[{0, 242, 0, -1}, {1, 4, 241, 968}, 30] (* Harvey P. Dale, Jan 20 2020 *)

Crossrefs

Cf. A042768, A040884.

Sequence in context: A094073 A137342 A152793 * A332124 A091792 A300595

Adjacent sequences: A042766 A042767 A042768 * A042770 A042771 A042772

Keyword

nonn,frac,easy

Author

N. J. A. Sloane.

Extensions

More terms from Colin Barker, Dec 23 2013

Status

approved