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A041489 Denominators of continued fraction convergents to sqrt(261). 2
1, 6, 13, 45, 328, 373, 1447, 1820, 5087, 6907, 25808, 32715, 254813, 797154, 1849121, 11891880, 382389281, 2306227566, 4994844413, 17290760805, 126030170048, 143320930853, 555992962607, 699313893460, 1954620749527, 2653934642987, 9916424678488, 12570359321475 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

FORMULA

a(n) = 384238402*a(n-16) - a(n-32) for n>31. [Bruno Berselli, Dec 18 2013]

MATHEMATICA

Denominator[Convergents[Sqrt[261], 30]] (* Vincenzo Librandi, Dec 18 2013 *)

CROSSREFS

Cf. A041488.

Sequence in context: A239794 A034753 A100905 * A239530 A131188 A247939

Adjacent sequences:  A041486 A041487 A041488 * A041490 A041491 A041492

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vincenzo Librandi, Dec 18 2013

STATUS

approved

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Last modified October 1 17:24 EDT 2020. Contains 337443 sequences. (Running on oeis4.)