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A174767
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y-values in the solution to x^2 - 23*y^2 = 1.
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3
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0, 5, 240, 11515, 552480, 26507525, 1271808720, 61020311035, 2927703120960, 140468729495045, 6739571312641200, 323358954277282555, 15514490233996921440, 744372172277574946565, 35714349779089600513680
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OFFSET
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1,2
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COMMENTS
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The corresponding values of x of this Pell equation are in A114051.
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LINKS
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FORMULA
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a(n) = 48*a(n-1)-a(n-2) with a(1)=0, a(2)=5.
G.f.: 5*x^2/(1-48*x+x^2).
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MATHEMATICA
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LinearRecurrence[{48, -1}, {0, 5}, 30]
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PROG
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(Magma) I:=[0, 5]; [n le 2 select I[n] else 48*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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STATUS
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approved
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