login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A041919 Denominators of continued fraction convergents to sqrt(481). 2
1, 1, 14, 15, 29, 44, 205, 864, 1069, 1933, 3002, 40959, 43961, 1887321, 1931282, 26993987, 28925269, 55919256, 84844525, 395297356, 1666033949, 2061331305, 3727365254, 5788696559, 78980420521, 84769117080, 3639283337881, 3724052454961, 52051965252374 (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) = 1928280*a(n-13) + a(n-26) for n>25. - Vincenzo Librandi, Dec 27 2013

MATHEMATICA

Denominator[Convergents[Sqrt[481], 40]] (* Harvey P. Dale, Mar 31 2012 *)

PROG

(MAGMA) I:=[1, 1, 14, 15, 29, 44, 205, 864, 1069, 1933, 3002, 40959, 43961, 1887321, 1931282, 26993987, 28925269, 55919256, 84844525, 395297356, 1666033949, 2061331305, 3727365254, 5788696559, 78980420521, 84769117080]; [n le 26 select I[n] else 1928280*Self(n-13)+Self(n-26): n in [1..40]]; // Vincenzo Librandi, Dec 27 2013

CROSSREFS

Cf. A041918.

Sequence in context: A075659 A022104 A041398 * A041400 A041396 A041394

Adjacent sequences:  A041916 A041917 A041918 * A041920 A041921 A041922

KEYWORD

nonn,frac,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vincenzo Librandi, Dec 27 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 20 17:42 EDT 2021. Contains 347588 sequences. (Running on oeis4.)