OFFSET
1,1
MATHEMATICA
cf46Q[n_]:=Module[{s=Sqrt[n], cf, len}, cf=If[IntegerQ[s], {1, 1}, ContinuedFraction[ s][[2]]]; len=Length[cf]; OddQ[len] && cf[[(len-1)/2]] == cf[[(len+1)/2]]==46]; Select[Range[500000], cf46Q] (* Harvey P. Dale, Apr 14 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
First term 2117 removed by Georg Fischer, Jun 16 2019
STATUS
approved