OFFSET
1,1
MATHEMATICA
cf80Q[n_]:=Module[{s=Sqrt[n], cf, len}, cf=If[IntegerQ[s], {0, 0}, ContinuedFraction[s][[2]]]; len=Length[cf]; OddQ[len]&&cf[[Floor[len/2]]]==cf[[Ceiling[len/2]]]==80]; Select[Range[155*10^4], cf80Q] (* Harvey P. Dale, Jul 24 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
First term 6401 removed by Georg Fischer, Jun 16 2019
STATUS
approved