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A020364 Numbers k such that the continued fraction for sqrt(k) has period 25. 0

%I #12 Jul 11 2021 07:25:00

%S 457,881,1049,1181,1189,1306,1585,1594,1754,2125,2797,2906,4121,4157,

%T 4234,4253,4330,4442,4469,4517,4913,5077,5597,6418,7442,8249,8345,

%U 8570,8689,8825,9593,10145,10301,10498,10625,10673,10889,11401,11930,12053

%N Numbers k such that the continued fraction for sqrt(k) has period 25.

%t cf25Q[n_]:=Module[{s=Sqrt[n]},If[IntegerQ[s],1,Length[ ContinuedFraction[ s][[2]]]]==25]; Select[Range[13000],cf25Q] (* _Harvey P. Dale_, May 05 2020 *)

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified March 3 10:21 EST 2024. Contains 370510 sequences. (Running on oeis4.)