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A174752 x-values in the solution to x^2-41*y^2=1. 2
1, 2049, 8396801, 34410088449, 141012534067201, 577869330197301249, 2368108374136006451201, 9704507539340024239720449, 39769069528107045198367948801, 162973637221675131882887614466049 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The corresponding values of y of this Pell equation are in A174778.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

Index entries for linear recurrences with constant coefficients, signature (4098,-1).

FORMULA

a(n) = 4098*a(n-1)-a(n-2) with a(1)=1, a(2)=2049.

G.f.: x*(1-2049*x)/(1-4098*x+x^2).

MATHEMATICA

LinearRecurrence[{4098, -1}, {1, 2049}, 30]

PROG

(MAGMA) I:=[1, 2049]; [n le 2 select I[n] else 4098*Self(n-1)-Self(n-2): n in [1..20]];

CROSSREFS

Cf. A174778.

Sequence in context: A013959 A036089 A123095 * A045059 A224119 A183842

Adjacent sequences:  A174749 A174750 A174751 * A174753 A174754 A174755

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Apr 13 2010

STATUS

approved

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Last modified June 13 14:23 EDT 2021. Contains 345003 sequences. (Running on oeis4.)