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A176370 x-values in the solution to x^2 - 66*y^2 = 1. 2
1, 65, 8449, 1098305, 142771201, 18559157825, 2412547746049, 313612647828545, 40767231669964801, 5299426504447595585, 688884678346517461249, 89549708758542822366785, 11640773253932220390220801 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The corresponding values of y of this Pell equation are in A176372.
LINKS
FORMULA
a(n) = 130*a(n-1) - a(n-2) with a(1)=1, a(2)=65.
G.f.: x*(1-65*x)/(1-130*x+x^2).
MAPLE
seq(coeff(series(x*(1-65*x)/(1-130*x+x^2), x, n+1), x, n), n = 1..15); # G. C. Greubel, Dec 08 2019
MATHEMATICA
LinearRecurrence[{130, -1}, {1, 65}, 30]
PROG
(Magma) I:=[1, 65]; [n le 2 select I[n] else 130*Self(n-1)-Self(n-2): n in [1..20]];
(PARI) my(x='x+O('x^15)); Vec(x*(1-65*x)/(1-130*x+x^2)) \\ G. C. Greubel, Dec 08 2019
(Sage)
def A176368_list(prec):
P.<x> = PowerSeriesRing(ZZ, prec)
return P( x*(1-65*x)/(1-130*x+x^2) ).list()
a=A176368_list(15); a[1:] # G. C. Greubel, Dec 08 2019
(GAP) a:=[1, 65];; for n in [3..15] do a[n]:=130*a[n-1]-a[n-2]; od; a; # G. C. Greubel, Dec 08 2019
CROSSREFS
Cf. A176372.
Sequence in context: A144661 A296144 A251150 * A093265 A264541 A323316
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 16 2010
STATUS
approved

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Last modified April 16 19:21 EDT 2024. Contains 371754 sequences. (Running on oeis4.)