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A020416 Numbers k such that the continued fraction for sqrt(k) has period 77. 0

%I #12 Jul 11 2021 07:23:24

%S 5857,5861,6101,7001,7141,7834,8314,8429,8989,10289,10789,11041,11101,

%T 11482,11581,11626,12377,13217,13309,13997,14261,16433,16949,17386,

%U 20521,21178,21277,21785,22013,22753,27877,28493,28793,29285,29333,29341,30169

%N Numbers k such that the continued fraction for sqrt(k) has period 77.

%t cf77Q[n_]:=Module[{s=Sqrt[n]},!IntegerQ[s]&&Length[ContinuedFraction[s][[2]]]==77]; Select[Range[31000],cf77Q] (* _Harvey P. Dale_, Aug 04 2013 *)

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)