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A042309 Denominators of continued fraction convergents to sqrt(681). 2
1, 10, 21, 52, 73, 125, 323, 2063, 14764, 46355, 107474, 153829, 2568738, 2722567, 8013872, 26764183, 195363153, 1198943101, 2593249355, 3792192456, 6385441811, 16563076078, 39511593967, 411679015748, 21446820412863, 214879883144378 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
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, 0, 0, 0, 0, 0, 0, 21486332006830, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).
FORMULA
a(n) = 21486332006830*a(n-24) - a(n-48) for n>47. - Vincenzo Librandi, Jan 20 2014
MATHEMATICA
Denominator[Convergents[Sqrt[681], 30]] (* Vincenzo Librandi, Jan 20 2014 *)
CROSSREFS
Cf. A042308.
Sequence in context: A122963 A067520 A219884 * A215757 A048697 A090076
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Jan 20 2014
STATUS
approved

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Last modified March 28 16:12 EDT 2024. Contains 371254 sequences. (Running on oeis4.)