

A174765


yvalues in the solution to x^2  19*y^2 = 1.


3



0, 39, 13260, 4508361, 1532829480, 521157514839, 177192022215780, 60244766395850361, 20483043382566906960, 6964174505306352516039, 2367798848760777288546300, 805044644404158971753225961
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OFFSET

1,2


COMMENTS

The corresponding values of x of this Pell equation are in A114048.


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200
Index to sequences with linear recurrences with constant coefficients, signature (340,1).


FORMULA

a(n) = 340*a(n1)a(n2) with a(1)=0, a(2)=39.
G.f.: 39*x^2/(1340*x+x^2).


MATHEMATICA

LinearRecurrence[{340, 1}, {0, 39}, 30]


PROG

(MAGMA) I:=[0, 39]; [n le 2 select I[n] else 340*Self(n1)Self(n2): n in [1..20]];


CROSSREFS

Cf. A114048.
Sequence in context: A145619 A027490 A210327 * A115462 A112950 A173364
Adjacent sequences: A174762 A174763 A174764 * A174766 A174767 A174768


KEYWORD

nonn,easy


AUTHOR

Vincenzo Librandi, Apr 14 2010


STATUS

approved



