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 A020379 Numbers k such that the continued fraction for sqrt(k) has period 40. 0
 526, 589, 718, 721, 862, 1399, 1401, 1468, 1661, 2229, 2428, 2575, 2606, 2681, 2766, 2818, 2872, 2879, 2942, 3064, 3084, 3177, 3289, 3322, 3415, 3516, 3623, 3712, 3904, 3914, 3982, 4024, 4135, 4159, 4162, 4236, 4288, 4316, 4399, 4577, 4684, 4717, 4748 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..43. MATHEMATICA cfp40Q[n_]:=Module[{c=Sqrt[n]}, !IntegerQ[c]&&Length[ContinuedFraction[c] [[2]]]==40]; Select[Range[5000], cfp40Q] (* Harvey P. Dale, Mar 25 2012 *) CROSSREFS Cf. A003285. Sequence in context: A204692 A168308 A294984 * A251022 A251108 A204472 Adjacent sequences: A020376 A020377 A020378 * A020380 A020381 A020382 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified September 11 23:02 EDT 2024. Contains 375842 sequences. (Running on oeis4.)