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A228521 x-values in the solution to the Pell equation x^2 - 29*y^2 = -1. 2
70, 1372210, 26898060350, 527255777608490, 10335267725783560630, 202591917433553577860770, 3971206755197249507443252910, 77843594612784567411349065681050, 1525890137628596335200014878036689190, 29910498399952150749806124227926115821330 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Colin Barker, Table of n, a(n) for n = 1..200

Index entries for linear recurrences with constant coefficients, signature (19602,-1).

FORMULA

a(n) = 19602*a(n-1)-a(n-2).

G.f.: 70*x*(x+1) / (x^2-19602*x+1).

PROG

(PARI) Vec(70*x*(x+1)/(x^2-19602*x+1) + O(x^100))

CROSSREFS

Cf. A228522 gives the corresponding y-values.

Sequence in context: A172659 A172759 A172829 * A222746 A066789 A103165

Adjacent sequences:  A228518 A228519 A228520 * A228522 A228523 A228524

KEYWORD

nonn,easy

AUTHOR

Colin Barker, Aug 24 2013

STATUS

approved

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Last modified January 25 18:32 EST 2022. Contains 350572 sequences. (Running on oeis4.)