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A174780
y-values in the solution to x^2-43*y^2=1.
2
0, 531, 3697884, 25752063645, 179337367525896, 1248905401698276099, 8697377038089427227540, 60568532444349369514312461, 421799251245071971208244750864, 2937409925102148763144846930704435, 20456122296612112741468742817180934476
OFFSET
1,2
COMMENTS
The corresponding values of x of this Pell equation are in A174753.
FORMULA
a(n) = 6964*a(n-1)-a(n-2) with a(1)=0, a(2)=531.
G.f.: 531*x^2/(1-6964*x+x^2).
MATHEMATICA
LinearRecurrence[{6964, -1}, {0, 531}, 20] (* Harvey P. Dale, Nov 21 2011 *)
PROG
(Magma) I:=[0, 531]; [n le 2 select I[n] else 6964*Self(n-1)-Self(n-2): n in [1..15]];
CROSSREFS
Cf. A174753.
Sequence in context: A225937 A225936 A098257 * A191950 A333102 A048055
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 15 2010
EXTENSIONS
More terms from Harvey P. Dale, Nov 21 2011
STATUS
approved