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A042243 Denominators of continued fraction convergents to sqrt(647). 2
1, 2, 7, 16, 39, 55, 94, 431, 10869, 43907, 54776, 98683, 252142, 602967, 2061043, 4725053, 238313693, 481352439, 1682371010, 3846094459, 9374559928, 13220654387, 22595214315, 103601511647, 2612633005490, 10554133533607, 13166766539097 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) = 240374736*a(n-16) - a(n-32) for n>31. - Vincenzo Librandi, Jan 18 2014

MATHEMATICA

Denominator[Convergents[Sqrt[647], 30]] (* Harvey P. Dale, May 12 2012 *)

CROSSREFS

Cf. A042242.

Sequence in context: A176805 A224227 A260505 * A293378 A041887 A129441

Adjacent sequences:  A042240 A042241 A042242 * A042244 A042245 A042246

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vincenzo Librandi, Jan 18 2014

STATUS

approved

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Last modified July 17 08:37 EDT 2019. Contains 325095 sequences. (Running on oeis4.)