A042539 Denominators of continued fraction convergents to sqrt(798).

1, 4, 225, 904, 50849, 204300, 11491649, 46170896, 2597061825, 10434418196, 586924480801, 2358132341400, 132642335599201, 532927474738204, 29976580920938625, 120439251158492704, 6774574645796530049, 27218737834344612900, 1531023893369094852449

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Index entries for linear recurrences with constant coefficients, signature (0,226,0,-1).

Formula

G.f.: -(x^2-4*x-1) / (x^4-226*x^2+1). - Colin Barker, Dec 17 2013

Mathematica

Denominator[Convergents[Sqrt[798], 30]] (* Vincenzo Librandi, Jan 23 2014 *)
LinearRecurrence[{0, 226, 0, -1}, {1, 4, 225, 904}, 20] (* Harvey P. Dale, Aug 14 2021 *)

Crossrefs

Cf. A042538, A040769.

Sequence in context: A052209 A211610 A364481 * A182484 A159281 A290346

Adjacent sequences: A042536 A042537 A042538 * A042540 A042541 A042542

Keyword

nonn,frac,easy

Author

N. J. A. Sloane.

Extensions

More terms from Colin Barker, Dec 17 2013

Status

approved