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 A031811 Period of continued fraction for sqrt(n) contains exactly 43 ones. 0
 15871, 30847, 31171, 41839, 42631, 54859, 62923, 65591, 66187, 68056, 68944, 69299, 70855, 77875, 80999, 83931, 92491, 95875, 96695, 97507, 100264, 106856, 109336, 109855, 110707, 115216, 115519, 122200, 124415, 124931, 132995, 135143, 139551 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..33. MATHEMATICA cf43Q[n_]:=Module[{sn=Sqrt[n]}, !IntegerQ[sn]&&Count[ ContinuedFraction[ sn][[2]], 1]==43]; Select[Range[140000], cf43Q] (* Harvey P. Dale, Apr 25 2012 *) CROSSREFS Sequence in context: A184612 A277350 A101320 * A234318 A174596 A237071 Adjacent sequences: A031808 A031809 A031810 * A031812 A031813 A031814 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified December 6 22:36 EST 2023. Contains 367616 sequences. (Running on oeis4.)