login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A041778 Numerators of continued fraction convergents to sqrt(410). 2
20, 81, 3260, 13121, 528100, 2125521, 85548940, 344321281, 13858400180, 55777922001, 2244975280220, 9035679042881, 363672136995460, 1463724227024721, 58912641217984300, 237114289098961921 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
a(n) = 162*a(n-2)-a(n-4). G.f.: -(x^3-20*x^2-81*x-20)/(x^4-162*x^2+1). - Colin Barker, Jul 16 2012
MATHEMATICA
Numerator[Convergents[Sqrt[410], 40]] (* Vincenzo Librandi, Nov 13 2011 *)
LinearRecurrence[{0, 162, 0, -1}, {20, 81, 3260, 13121}, 30] (* Harvey P. Dale, Jul 19 2015 *)
CROSSREFS
Cf. A041779.
Sequence in context: A244449 A041776 A103532 * A219473 A256869 A156389
KEYWORD
nonn,cofr,easy,less
AUTHOR
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 11:14 EDT 2024. Contains 371278 sequences. (Running on oeis4.)