login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A041411 Denominators of continued fraction convergents to sqrt(220). 2
1, 1, 5, 6, 173, 179, 889, 1068, 30793, 31861, 158237, 190098, 5480981, 5671079, 28165297, 33836376, 975583825, 1009420201, 5013264629, 6022684830, 173648439869, 179671124699, 892332938665, 1072004063364 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (0,0,0,178,0,0,0,-1).

FORMULA

a(n) = 178*a(n-4)-a(n-8). G.f.: -(x^2-x-1)*(x^4+6*x^2+1)/(x^8-178*x^4+1). [Colin Barker, Jul 16 2012]

MATHEMATICA

Denominator[Convergents[Sqrt[220], 30]] (* Vincenzo Librandi, Oct 25 2013 *)

CROSSREFS

Cf. A041410.

Sequence in context: A078984 A266718 A041257 * A103089 A041601 A301648

Adjacent sequences:  A041408 A041409 A041410 * A041412 A041413 A041414

KEYWORD

nonn,cofr,frac,easy

AUTHOR

N. J. A. Sloane.

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 February 18 05:14 EST 2019. Contains 320245 sequences. (Running on oeis4.)