A042270 Numerators of continued fraction convergents to sqrt(661).

25, 26, 77, 180, 797, 3368, 54685, 58053, 577162, 1212377, 1789539, 22686845, 115223764, 137910609, 253134373, 391044982, 1035224337, 1426269319, 5314032294, 6740301613, 12054333907, 42903303334

Offset

0,1

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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5730908870845166436, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).

Formula

a(n) = 5730908870845166436*a(n-39) + a(n-78) for n>77. [Bruno Berselli, Nov 22 2013]

Mathematica

Numerator[Convergents[Sqrt[661], 30]] (* Vincenzo Librandi, Nov 20 2013 *)

Crossrefs

Cf. A042271.

Sequence in context: A042250 A042272 A042274 * A042268 A042266 A042278

Adjacent sequences: A042267 A042268 A042269 * A042271 A042272 A042273

Keyword

nonn,cofr,frac,easy

Author

N. J. A. Sloane.

Status

approved