login
A042393
Denominators of continued fraction convergents to sqrt(723).
2
1, 1, 8, 9, 476, 485, 3871, 4356, 230383, 234739, 1873556, 2108295, 111504896, 113613191, 906797233, 1020410424, 53968139281, 54988549705, 438887987216, 493876536921, 26120467907108, 26614344444029, 212420879015311, 239035223459340, 12642252498900991
OFFSET
0,3
LINKS
FORMULA
G.f.: -(x^2-x-1)*(x^4+9*x^2+1) / (x^8-484*x^4+1). - Colin Barker, Dec 10 2013
MATHEMATICA
Denominator[Convergents[Sqrt[723], 30]] (* Harvey P. Dale, May 01 2013 *)
CoefficientList[Series[(1 + x - x^2) (x^4 + 9 x^2 + 1)/(x^8 - 484 x^4 + 1), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 21 2014 *)
PROG
(Magma) I:=[1, 1, 8, 9, 476, 485, 3871, 4356]; [n le 8 select I[n] else 484*Self(n-4)-Self(n-8): n in [1..30]]; // Vincenzo Librandi, Jan 21 2014
CROSSREFS
Sequence in context: A239524 A115073 A298020 * A264777 A114132 A038704
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Dec 10 2013
STATUS
approved