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A041143
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Denominators of continued fraction convergents to sqrt(80).
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1
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0, 1, 1, 17, 18, 305, 323, 5473, 5796, 98209, 104005, 1762289, 1866294, 31622993, 33489287, 567451585, 600940872, 10182505537, 10783446409, 182717648081, 193501094490, 3278735159921, 3472236254411, 58834515230497, 62306751484908, 1055742538989025
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OFFSET
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0,4
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COMMENTS
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To Editor(s): Output of Mathematica program similar to: A041135, A041137, A041139, A041141 is: 1,1,17,18,305,323,5473,5796,... (First term is "1") (?)
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LINKS
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Table of n, a(n) for n=0..25.
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FORMULA
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G.f.: x*(1+x-x^2)/(1-18*x^2+x^4). a(n)=18*a(n-2)-a(n-4).
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MATHEMATICA
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Denominator/@Convergents[Sqrt[80], 50] (* From Vladimir Joseph Stephan Orlovsky, Jul 05 2011 *)
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CROSSREFS
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Cf. A041142.
Sequence in context: A041606 A140142 A197351 * A041608 A041609 A041610
Adjacent sequences: A041140 A041141 A041142 * A041144 A041145 A041146
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KEYWORD
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nonn,cofr,easy
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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