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A031818 Period of continued fraction for sqrt(n) contains exactly 50 ones. 0

%I

%S 3004,3676,3691,4414,5377,5413,5509,5524,5692,5721,5758,6009,6091,

%T 6349,6541,6781,6796,6871,6961,7009,7041,7149,7321,7609,7729,7732,

%U 7996,8179,8529,8617,8881,8902,8929,8969,9013,9172,9249,9397,9589,9706,9733,9851

%N Period of continued fraction for sqrt(n) contains exactly 50 ones.

%t upto=10000;With[{t=Complement[Range[upto],Range[Floor[Sqrt[ upto]]]^2]}, Select[t, Count[ContinuedFraction[Sqrt[#]][[2]],1]==50&]] (* _Harvey P. Dale_, Dec 02 2011 *)

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified October 20 15:23 EDT 2021. Contains 348111 sequences. (Running on oeis4.)