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A228545
y-values in the solution to the Pell equation x^2 - 61*y^2 = -1.
2
3805, 13441687959085, 47484618985691536216525, 167745974097868037701201304210365, 592585818884249810512279448635131669269245, 2093391240125028732597213302973032198405669402485645, 7395193648885142783524984383830700400156283141778553755833965
OFFSET
1,1
COMMENTS
All terms are multiples of 3805.
FORMULA
a(n) = 3532638098*a(n-1)-a(n-2).
G.f.: -3805*x*(x-1) / (x^2-3532638098*x+1)
PROG
(PARI) Vec(-3805*x*(x-1)/(x^2-3532638098*x+1) + O(x^20))
CROSSREFS
Cf. A228544 gives the corresponding x-values.
Sequence in context: A251518 A031793 A234765 * A179174 A232083 A234668
KEYWORD
nonn,easy
AUTHOR
Colin Barker, Aug 25 2013
STATUS
approved