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A042306
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Numerators of continued fraction convergents to sqrt(680).
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2
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26, 339, 17654, 229841, 11969386, 155831859, 8115226054, 105653770561, 5502111295226, 71633100608499, 3730423342937174, 48567136558791761, 2529221524400108746, 32928446953760205459, 1714808463119930792614
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OFFSET
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0,1
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LINKS
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FORMULA
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MATHEMATICA
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Numerator[Convergents[Sqrt[680], 30]] (* or *) CoefficientList[Series[(26 + 339 x + 26 x^2 - x^3)/(1 - 678 x^2 + x^4), {x, 0, 30}], x] (* Vincenzo Librandi, Nov 21 2013 *)
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PROG
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(Magma) I:=[26, 339, 17654, 229841]; [n le 4 select I[n] else 678*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Nov 21 2013
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CROSSREFS
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KEYWORD
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nonn,cofr,frac,easy
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AUTHOR
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STATUS
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approved
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