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A042507 Denominators of continued fraction convergents to sqrt(781). 2
1, 1, 18, 19, 37, 56, 317, 373, 690, 3133, 3823, 6956, 38603, 45559, 84162, 129721, 2289419, 2419140, 132922979, 135342119, 2433739002, 2569081121, 5002820123, 7571901244, 42862326343, 50434227587, 93296553930, 423620443307, 516916997237 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

FORMULA

a(n) = 135212398*a(n-18) - a(n-36) for n>35. - Vincenzo Librandi, Jan 23 2014

MATHEMATICA

Denominator[Convergents[Sqrt[781], 301]] (* Vincenzo Librandi, Jan 23 2014 *)

CROSSREFS

Cf. A040753, A042506.

Sequence in context: A022108 A041654 A041656 * A041658 A041652 A041650

Adjacent sequences:  A042504 A042505 A042506 * A042508 A042509 A042510

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vincenzo Librandi, Jan 23 2014

STATUS

approved

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Last modified December 8 09:32 EST 2019. Contains 329862 sequences. (Running on oeis4.)