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A020366 Numbers k such that the continued fraction for sqrt(k) has period 27. 0
949, 1109, 1261, 1354, 1361, 1402, 1721, 1889, 1921, 2221, 2561, 2957, 3229, 3821, 4021, 4373, 4481, 4973, 4985, 5473, 5545, 5729, 5765, 5825, 6065, 6322, 6458, 6617, 6730, 6869, 6925, 6938, 7109, 7913, 7985, 8077, 9034, 9146, 9178, 9509, 10061, 10930 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
cf27Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Length[ ContinuedFraction[ s][[2]]]] == 27]; Select[Range[11000], cf27Q] (* Harvey P. Dale, Jan 21 2019 *)
CROSSREFS
Sequence in context: A192770 A187627 A170830 * A217936 A013532 A108896
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 25 06:40 EST 2024. Contains 370310 sequences. (Running on oeis4.)