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A042241
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Denominators of continued fraction convergents to sqrt(646).
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2
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1, 2, 5, 12, 605, 1222, 3049, 7320, 369049, 745418, 1859885, 4465188, 225119285, 454703758, 1134526801, 2723757360, 137322394801, 277368546962, 692059488725, 1661487524412, 83766435709325, 169194358943062, 422155153595449, 1013504666133960, 51097388460293449
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: -(x^2 - 2*x - 1)*(x^4 + 6*x^2 + 1) / (x^8 - 610*x^4 + 1). - Colin Barker, Dec 05 2013
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MATHEMATICA
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PROG
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(Magma) I:=[1, 2, 5, 12, 605, 1222, 3049, 7320]; [n le 8 select I[n] else 610*Self(n-4)-Self(n-8): n in [1..30]]; // Vincenzo Librandi, Jan 18 2014
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CROSSREFS
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KEYWORD
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nonn,frac,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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