OFFSET
1,1
MATHEMATICA
cf90Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Length[ContinuedFraction[s][[2]]]] == 90]; Select[Range[16000], cf90Q] (* Harvey P. Dale, Feb 28 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved