A042227 Denominators of continued fraction convergents to sqrt(639).

1, 3, 4, 7, 18, 79, 334, 413, 1986, 2399, 11582, 48727, 109036, 157763, 266799, 958160, 48174799, 145482557, 193657356, 339139913, 871937182, 3826888641, 16179491746, 20006380387, 96205013294, 116211393681, 561050588018, 2360413745753, 5281878079524

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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48441598, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).

Mathematica

Denominator[Convergents[Sqrt[639], 40]] (* Harvey P. Dale, Oct 08 2012 *)

Crossrefs

Cf. A042226.

Sequence in context: A109749 A307738 A041497 * A117789 A169892 A246805

Adjacent sequences: A042224 A042225 A042226 * A042228 A042229 A042230

Keyword

nonn,frac,easy

Author

N. J. A. Sloane.

Extensions

More terms from Vincenzo Librandi, Jan 17 2014

Status

approved