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A174778 y-values in the solution to x^2 - 41*y^2 = 1. 2
0, 320, 1311360, 5373952960, 22022457918720, 90248027176961600, 369836393348730718080, 1515589449695071305730240, 6210885195014008862151805440, 25452206013577958622026792962880 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The corresponding values of x of this Pell equation are in A174752.
LINKS
FORMULA
a(n) = 4098*a(n-1)-a(n-2) with a(1)=0, a(2)=320.
G.f.: 320*x^2/(1-4098*x+x^2).
MATHEMATICA
LinearRecurrence[{4098, -1}, {0, 320}, 30]
PROG
(Magma) I:=[0, 320]; [n le 2 select I[n] else 4098*Self(n-1)-Self(n-2): n in [1..20]];
CROSSREFS
Cf. A174752.
Sequence in context: A045813 A121011 A264063 * A300849 A351994 A261262
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 15 2010
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)