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A176377
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x-values in the solution to x^2-70*y^2=1.
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2
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1, 251, 126001, 63252251, 31752504001, 15939693756251, 8001694513134001, 4016834705899512251, 2016443020667042016001, 1012250379540149192520251, 508147674086134227603150001, 255089120140859842107588780251
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OFFSET
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1,2
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COMMENTS
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The corresponding values of y of this Pell equation are in A176378.
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LINKS
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FORMULA
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a(n) = 502*a(n-1)-a(n-2) with a(1)=1, a(2)=251.
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MATHEMATICA
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LinearRecurrence[{502, -1}, {1, 251}, 20] (* or *) CoefficientList[ Series[ (1-251 x)/(1-502 x+x^2), {x, 0, 20}], x] (* Harvey P. Dale, Jun 14 2011 *)
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PROG
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(Magma) I:=[1, 251]; [n le 2 select I[n] else 502*Self(n-1)-Self(n-2): n in [1..20]];
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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Definition rewritten and g.f. adapted to the offset from Bruno Berselli, Dec 15 2011
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STATUS
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approved
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