A042235 Denominators of continued fraction convergents to sqrt(643).

1, 2, 3, 11, 14, 235, 1894, 4023, 5917, 9940, 55617, 1400365, 7057442, 8457807, 15515249, 39488305, 331421689, 5342235329, 5673657018, 22363206383, 28036863401, 78436933185, 3949883522651, 7978203978487, 11928087501138, 43762466481901

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, 0, 3977920386052, 0, 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[643], 30]] (* Harvey P. Dale, Aug 05 2011 *)

Crossrefs

Cf. A042234.

Sequence in context: A041235 A036972 A041637 * A050587 A293026 A178430

Adjacent sequences: A042232 A042233 A042234 * A042236 A042237 A042238

Keyword

nonn,frac,easy

Author

N. J. A. Sloane.

Extensions

More terms from Vincenzo Librandi, Jan 17 2014

Status

approved