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A042221 Denominators of continued fraction convergents to sqrt(636). 2
1, 4, 5, 9, 32, 105, 1292, 3981, 13235, 17216, 30451, 139020, 6981451, 28064824, 35046275, 63111099, 224379572, 736249815, 9059377352, 27914381871, 92802522965, 120716904836, 213519427801, 974794616040, 48953250229801, 196787795535244 (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) = 7011902*a(n-12) - a(n-24) for n>23. - Vincenzo Librandi, Jan 17 2014

MATHEMATICA

Denominator[Convergents[Sqrt[636], 30]] (* Harvey P. Dale, Jan 28 2013 *)

CROSSREFS

Cf. A042220.

Sequence in context: A336661 A352509 A222543 * A341252 A041151 A279919

Adjacent sequences: A042218 A042219 A042220 * A042222 A042223 A042224

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vincenzo Librandi, Jan 17 2014

STATUS

approved

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Last modified February 2 06:48 EST 2023. Contains 360000 sequences. (Running on oeis4.)