A176387 y-values in the solution to x^2-74*y^2=1.

0, 430, 3181140, 23534073290, 174105071018280, 1288029291859162150, 9528840527069010567420, 70494360931227248318611010, 521517272640378655992073684560

Offset

1,2

Comments

The corresponding values of x of this Pell equation are in A176386.

Links

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

Index entries for linear recurrences with constant coefficients, signature (7398,-1).

Formula

a(n) = 7398*a(n-1)-a(n-2) with a(1)=0, a(2)=430.

G.f.: 430*x^2/(1-7398*x+x^2).

Mathematica

LinearRecurrence[{7398, -1}, {0, 430}, 20]

Prog

(Magma) I:=[0, 430]; [n le 2 select I[n] else 7398*Self(n-1)-Self(n-2): n in [1..10]];

Crossrefs

Cf. A176386.

Sequence in context: A203545 A230574 A208627 * A160518 A273807 A323047

Adjacent sequences: A176384 A176385 A176386 * A176388 A176389 A176390

Keyword

nonn,easy

Author

Vincenzo Librandi, Apr 16 2010

Status

approved