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 A064932 Period length of the continued fraction for sqrt(3^(2n+1)). 4
 2, 10, 30, 98, 270, 818, 2382, 7282, 21818, 65650, 196406, 589982, 1768938, 5309294, 15924930, 47779238, 143322850, 429998586, 1289970842, 3869957114, 11609762666, 34829416842, 104488103446 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Lim_{n->inf} a(n)/3^n = 1.11... - A.H.M. Smeets, Oct 25 2017 REFERENCES R. K. Guy, personal communication. LINKS FORMULA a(n) = A003285(A013708(n)). - Michel Marcus, Sep 25 2019 MATHEMATICA Table[Length[Last[ContinuedFraction[Sqrt[3^(2n+1)] ]]], {n, 10}] CROSSREFS Cf. A003285, A013708, A059927. Sequence in context: A234471 A196317 A318579 * A343513 A285956 A219667 Adjacent sequences:  A064929 A064930 A064931 * A064933 A064934 A064935 KEYWORD hard,nonn,more AUTHOR Wouter Meeussen, Oct 26 2001 EXTENSIONS a(11)-a(13) from A.H.M. Smeets, Sep 28 2017 a(14) from A.H.M. Smeets, Oct 08 2017 a(15)-a(19) from Daniel Suteu, Jan 24 2019 a(20) from Chai Wah Wu, Sep 23 2019 a(21)-a(23) from Chai Wah Wu, Sep 25 2019 STATUS approved

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Last modified May 12 19:15 EDT 2021. Contains 343829 sequences. (Running on oeis4.)