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A174755 x-values in the solution to x^2-47*y^2=1. 2
1, 48, 4607, 442224, 42448897, 4074651888, 391124132351, 37543842053808, 3603817713033217, 345928956609135024, 33205576016763929087, 3187389368652728057328, 305956173814645129574401 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The corresponding values of y of this Pell equation are in A174853.
LINKS
FORMULA
a(n) = 96*a(n-1)-a(n-2) with a(1)=1, a(2)=48.
G.f.: x*(1-48*x)/(1-96*x+x^2).
MATHEMATICA
LinearRecurrence[{96, -1}, {1, 48}, 30]
PROG
(Magma) I:=[1, 48]; [n le 2 select I[n] else 96*Self(n-1)-Self(n-2): n in [1..20]];
CROSSREFS
Cf. A174853.
Sequence in context: A270253 A098209 A208793 * A269419 A299422 A321940
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 13 2010
STATUS
approved

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Last modified May 29 00:29 EDT 2024. Contains 372921 sequences. (Running on oeis4.)