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A020402 Numbers k such that the continued fraction for sqrt(k) has period 63. 0
1801, 2161, 2281, 2749, 3389, 3457, 3673, 5161, 5381, 5441, 5801, 6277, 6917, 7969, 10489, 11093, 11177, 11185, 12893, 13397, 14954, 16453, 17657, 17770, 18541, 18554, 21509, 22985, 23825, 23873, 24113, 25882, 25909, 26186, 27185, 27785, 28306, 28453 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
p63Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 0, Length[ContinuedFraction[s] [[2]]]] == 63]; Select[Range[30000], p63Q] (* Harvey P. Dale, Apr 17 2015 *)
CROSSREFS
Cf. A003285.
Sequence in context: A025139 A035767 A107563 * A180685 A222418 A252676
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified May 28 18:29 EDT 2024. Contains 372919 sequences. (Running on oeis4.)