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A042169
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Denominators of continued fraction convergents to sqrt(609).
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2
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1, 1, 3, 28, 31, 59, 385, 444, 829, 7905, 16639, 24544, 1194751, 1219295, 3633341, 33919364, 37552705, 71472069, 466385119, 537857188, 1004242307, 9576037951, 20156318209, 29732356160, 1447309413889, 1477041770049, 4401392953987, 41089578355932
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OFFSET
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0,3
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1211390, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).
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FORMULA
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G.f.: -(x^22 - x^21 + 3*x^20 - 28*x^19 + 31*x^18 - 59*x^17 + 385*x^16 - 444*x^15 + 829*x^14 - 7905*x^13 + 16639*x^12 - 24544*x^11 - 16639*x^10 - 7905*x^9 - 829*x^8 - 444*x^7 - 385*x^6 - 59*x^5 - 31*x^4 - 28*x^3 - 3*x^2 - x - 1) / (x^24 - 1211390*x^12 + 1). - Colin Barker, Dec 03 2013
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MATHEMATICA
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Denominator[Convergents[Sqrt[609], 30]] (* Vincenzo Librandi, Jan 16 2014 *)
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CROSSREFS
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Cf. A042168, A040584.
Sequence in context: A064234 A224579 A037102 * A041785 A157848 A225674
Adjacent sequences: A042166 A042167 A042168 * A042170 A042171 A042172
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KEYWORD
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nonn,frac,easy
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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More terms from Colin Barker, Dec 03 2013
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STATUS
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approved
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