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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A175015 y-values in the solution to x^2-57*y^2=1. 2
0, 20, 6040, 1824060, 550860080, 166357920100, 50239541010120, 15172175027136140, 4581946618654104160, 1383732706658512320180, 417882695464252066590200, 126199190297497465597920220 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The corresponding values of x of this Pell equation are in A174759.

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (302,-1).

FORMULA

a(n) = 302*a(n-1)-a(n-2) with a(1)=0, a(2)=20.

G.f.: 20*x^2/(1-302*x+x^2).

MATHEMATICA

LinearRecurrence[{302, -1}, {0, 20}, 30]

PROG

(MAGMA) I:=[0, 20]; [n le 2 select I[n] else 302*Self(n-1)-Self(n-2): n in [1..20]];

CROSSREFS

Cf. A174759.

Sequence in context: A250020 A088852 A123379 * A135292 A222721 A223051

Adjacent sequences:  A175012 A175013 A175014 * A175016 A175017 A175018

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Apr 15 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 19 01:27 EST 2017. Contains 294912 sequences.