OFFSET
1,1
MATHEMATICA
cf91Q[n_]:=Module[{sr=Sqrt[n], p}, p=If[IntegerQ[sr], 1, Count[ ContinuedFraction[ sr][[2]], 1]]; p==91]; Select[Range[400000], cf91Q] (* Harvey P. Dale, Jan 22 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved