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A041801 Denominators of continued fraction convergents to sqrt(421). 2
1, 1, 2, 27, 137, 164, 629, 793, 2215, 3008, 5223, 8231, 21685, 203396, 225081, 1778963, 5561970, 18464873, 42491716, 103448305, 352836631, 1161958198, 8486544017, 9648502215, 95323063952, 200294630119, 295617694071, 495912324190, 791530018261, 2078972360712 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

FORMULA

a(n) = 88084891393642836*a(n-37) + a(n-74) for n>73. - Vincenzo Librandi, Dec 24 2013

MATHEMATICA

Denominator[Convergents[Sqrt[421], 30]] (* Vincenzo Librandi, Dec 24 2013 *)

CROSSREFS

Cf. A041800.

Sequence in context: A046735 A038625 A280089 * A166942 A119351 A098627

Adjacent sequences:  A041798 A041799 A041800 * A041802 A041803 A041804

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vincenzo Librandi, Dec 24 2013

STATUS

approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)