A041489 - OEIS

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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

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OFFSET

0,2

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 384238402, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).

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

Sequence in context: A034753 A100905 A353964 * 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