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A042293 Denominators of continued fraction convergents to sqrt(672). 2
1, 1, 12, 13, 662, 675, 8087, 8762, 446187, 454949, 5450626, 5905575, 300729376, 306634951, 3673713837, 3980348788, 202691153237, 206671502025, 2476077675512, 2682749177537, 136613536552362, 139296285729899, 1668872679581251, 1808168965311150 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (0,0,0,674,0,0,0,-1).

FORMULA

G.f.: -(x^2-x-1)*(x^4+13*x^2+1) / ((x^4-26*x^2+1)*(x^4+26*x^2+1)). - Colin Barker, Dec 07 2013

MATHEMATICA

Denominator[Convergents[Sqrt[672], 30]] (* Vincenzo Librandi, Jan 19 2014 *)

CROSSREFS

Cf. A042292, A040646.

Sequence in context: A275959 A066321 A099415 * A061097 A121288 A075477

Adjacent sequences:  A042290 A042291 A042292 * A042294 A042295 A042296

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Colin Barker, Dec 07 2013

STATUS

approved

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Last modified January 29 04:57 EST 2020. Contains 331335 sequences. (Running on oeis4.)