OFFSET
1,1
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
KEYWORD
nonn
AUTHOR
STATUS
approved