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A041161
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Denominators of continued fraction convergents to sqrt(90).
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2
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1, 2, 37, 76, 1405, 2886, 53353, 109592, 2026009, 4161610, 76934989, 158031588, 2921503573, 6001038734, 110940200785, 227881440304, 4212806126257, 8653493692818, 159975692596981, 328604878886780
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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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MATHEMATICA
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Denominator[Convergents[Sqrt[90], 30]] (* Harvey P. Dale, May 20 2013 *)
CoefficientList[Series[(1 + 2 x - x^2)/(x^4 - 38 x^2 + 1), {x, 0, 30}], x] (* Vincenzo Librandi, Dec 12 2013 *)
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PROG
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(Magma) I:=[1, 2, 37, 76]; [n le 4 select I[n] else 38*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Dec 12 2013
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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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STATUS
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approved
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