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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
OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 135212398, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).
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
Sequence in context: A022108 A041654 A041656 * A041658 A041652 A041650
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Jan 23 2014
STATUS
approved