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A031849 Period of continued fraction for sqrt(n) contains exactly 81 ones. 0
41827, 59599, 61771, 62875, 77851, 114091, 119695, 129823, 174031, 177331, 193483, 211579, 217663, 230263, 236567, 237703, 238067, 248811, 255547, 280135, 281695, 285112, 298915, 307739, 310991, 314843, 317531, 317615, 329203, 335443, 339607 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..31.

MATHEMATICA

cf81Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ContinuedFraction[ s][[2]], 1]]==81]; Select[Range[340000], cf81Q] (* Harvey P. Dale, Feb 25 2020 *)

CROSSREFS

Sequence in context: A251978 A258689 A258685 * A151818 A186604 A345154

Adjacent sequences: A031846 A031847 A031848 * A031850 A031851 A031852

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified March 24 15:00 EDT 2023. Contains 361479 sequences. (Running on oeis4.)