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A228544
x-values in the solution to the Pell equation x^2 - 61*y^2 = -1.
2
29718, 104982939026082, 370866730043548288842318, 1310137939832519884162097942405082, 4628243199887591481762707268904054133171718, 16349908254732334984625073953919472453334678640507282, 57758308799472135354556537295795833330948905641138816306457918
OFFSET
1,1
COMMENTS
All terms are multiples of 29718.
FORMULA
a(n) = 3532638098*a(n-1)-a(n-2).
G.f.: 29718*x*(x+1) / (x^2-3532638098*x+1).
PROG
(PARI) Vec(29718*x*(x+1)/(x^2-3532638098*x+1) + O(x^20))
CROSSREFS
Cf. A228545 gives the corresponding y-values.
Sequence in context: A236317 A204601 A203502 * A206203 A204283 A251054
KEYWORD
nonn,easy
AUTHOR
Colin Barker, Aug 25 2013
STATUS
approved