A042231 Denominators of continued fraction convergents to sqrt(641).

1, 3, 19, 22, 217, 673, 890, 3343, 4233, 24508, 28741, 53249, 294986, 348235, 1339691, 1687926, 6403469, 59319147, 65722616, 453654843, 1426687145, 71788012093, 216790723424, 1372532352637, 1589323076061, 15676440037186, 48618643187619, 64295083224805

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, 0, 0, 0, 0, 0, 72241666936, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).

Mathematica

Denominator[Convergents[Sqrt[641], 30]] (* Vincenzo Librandi, Jan 17 2014 *)

Crossrefs

Cf. A042230.

Sequence in context: A359314 A022128 A041381 * A191074 A019408 A070045

Adjacent sequences: A042228 A042229 A042230 * A042232 A042233 A042234

Keyword

nonn,frac,easy

Author

N. J. A. Sloane

Extensions

More terms from Vincenzo Librandi, Jan 17 2014

Status

approved