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A031780 Period of continued fraction for sqrt(n) contains exactly 12 ones. 0

%I

%S 211,214,382,385,393,436,457,487,501,511,524,526,553,559,581,614,657,

%T 716,749,781,831,846,856,862,869,875,881,893,950,996,1002,1019,1046,

%U 1094,1123,1132,1137,1169,1194,1234,1246,1266,1309,1334,1353,1359,1361,1372

%N Period of continued fraction for sqrt(n) contains exactly 12 ones.

%t cf12Q[n_]:=Module[{s=Sqrt[n]},If[IntegerQ[s],1,Count[ ContinuedFraction[ s][[2]], 1]] == 12]; Select[Range[1500],cf12Q] (* _Harvey P. Dale_, Jul 21 2015 *)

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified October 18 20:20 EDT 2021. Contains 348070 sequences. (Running on oeis4.)