

A041821


Denominators of continued fraction convergents to sqrt(431).


2



1, 1, 4, 21, 25, 71, 522, 593, 11789, 12382, 98463, 209308, 307771, 1748163, 5552260, 7300423, 297569180, 304869603, 1212177989, 6365759548, 7577937537, 21521634622, 158229379891, 179751014513, 3573498655638, 3753249670151, 29846246346695, 63445742363541
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OFFSET

0,3


LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 303121440, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).


FORMULA

a7n) = 303121440*a(n16) a(n32) for n>31.  Vincenzo Librandi, Dec 25 2013


MATHEMATICA

Denominator[Convergents[Sqrt[431], 50]] (* Harvey P. Dale, Jun 04 2012 *)


CROSSREFS

Cf. A041820.
Sequence in context: A305225 A272954 A133784 * A042429 A356357 A276400
Adjacent sequences: A041818 A041819 A041820 * A041822 A041823 A041824


KEYWORD

nonn,frac,easy


AUTHOR

N. J. A. Sloane.


EXTENSIONS

More terms from Vincenzo Librandi, Dec 25 2013


STATUS

approved



