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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A174745 y-values in the solution to  x^2 - 21*y^2 = 1. 3
0, 12, 1320, 145188, 15969360, 1756484412, 193197315960, 21249948271188, 2337301112514720, 257081872428348012, 28276668666005766600, 3110176471388205977988, 342091135184036651812080 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The corresponding values of x of this Pell equation are in A114049.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

Index entries for linear recurrences with constant coefficients, signature (110,-1).

FORMULA

a(n) = 110*a(n-1)-a(n-2) with a(1)=0, a(2)=12.

G.f.: 12*x^2/(1-110*x+x^2).

MATHEMATICA

LinearRecurrence[{110, -1}, {0, 12}, 30]

PROG

(MAGMA) I:=[0, 12]; [n le 2 select I[n] else 110*Self(n-1)-Self(n-2): n in [1..20]];

CROSSREFS

Cf. A114049.

Sequence in context: A137343 A133461 A246981 * A071309 A067108 A240627

Adjacent sequences:  A174742 A174743 A174744 * A174746 A174747 A174748

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Apr 14 2010

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 March 26 18:36 EDT 2019. Contains 321511 sequences. (Running on oeis4.)