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A174779 y-values in the solution to  x^2 - 42*y^2 = 1. 1
0, 2, 52, 1350, 35048, 909898, 23622300, 613269902, 15921395152, 413343004050, 10730996710148, 278592571459798, 7232675861244600, 187770979820899802, 4874812799482150252, 126557361806715006750, 3285616594175108025248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The corresponding values of x of this Pell equation are in  A097308.

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (26,-1).

FORMULA

a(n) = 26*a(n-1)-a(n-2) with a(1)=0, a(2)=2.

G.f.: 2*x^2/(1-26*x+x^2).

MATHEMATICA

LinearRecurrence[{26, -1}, {0, 2}, 30]

PROG

(MAGMA) I:=[0, 2]; [n le 2 select I[n] else 26*Self(n-1)-Self(n-2): n in [1..20]];

CROSSREFS

Cf. A097308.

Sequence in context: A284767 A101930 A297756 * A215744 A099882 A216611

Adjacent sequences:  A174776 A174777 A174778 * A174780 A174781 A174782

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Apr 15 2010

STATUS

approved

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Last modified November 12 19:33 EST 2019. Contains 329078 sequences. (Running on oeis4.)