A042247 Denominators of continued fraction convergents to sqrt(649).

1, 2, 19, 21, 61, 204, 265, 469, 1203, 1672, 7891, 9563, 160899, 974957, 3085770, 13318037, 43039881, 271557323, 4387957049, 4659514372, 23026014537, 27685528909, 78397072355, 106082601264, 184479673619, 659521622121, 1503522917861, 2163044539982

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, 0, 0, 0, 0, 0, 0, 0, 0, 2247186452324398, 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).

Maple

convert(sqrt(649), confrac, 30, cvgts): denom(cvgts); # Wesley Ivan Hurt, Feb 02 2014

Mathematica

Denominator[Convergents[Sqrt[649], 30]] (* Vincenzo Librandi, Jan 18 2014 *)

Crossrefs

Cf. A040623, A042246.

Sequence in context: A340922 A370460 A022119 * A041451 A268492 A130112

Adjacent sequences: A042244 A042245 A042246 * A042248 A042249 A042250

Keyword

nonn,frac,easy

Author

N. J. A. Sloane

Extensions

More terms from Vincenzo Librandi, Jan 18 2014

Status

approved