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A175672 y-values in the solution to x^2-28*y^2=1. 2
0, 24, 6096, 1548360, 393277344, 99890897016, 25371894564720, 6444361328541864, 1636842405555068736, 415751526649658917080, 105599250926607809869584, 26821793983831734047957256 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The corresponding values of x of this Pell equation are in A175633.

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (254,-1).

FORMULA

a(n) = 254*a(n-1)-a(n-2) with a(1)=0, a(2)=24.

G.f.: 24*x^2/(1-254*x+x^2).

MATHEMATICA

LinearRecurrence[{254, -1}, {0, 24}, 20]

PROG

(MAGMA) I:=[0, 24]; [n le 2 select I[n] else 254*Self(n-1)-Self(n-2): n in [1..15]];

CROSSREFS

Cf. A175633.

Sequence in context: A277001 A163576 A145408 * A181749 A266312 A181232

Adjacent sequences:  A175669 A175670 A175671 * A175673 A175674 A175675

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Dec 04 2010

STATUS

approved

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Last modified November 21 22:32 EST 2017. Contains 295054 sequences.