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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 October 28 07:43 EDT 2021. Contains 348321 sequences. (Running on oeis4.)