A020401 Numbers k such that the continued fraction for sqrt(k) has period 62.

1291, 1969, 2469, 3117, 3693, 3748, 3749, 3886, 4198, 4243, 4244, 4269, 4351, 4436, 4564, 4645, 5097, 5230, 5416, 5539, 5609, 6057, 6061, 6134, 6214, 6226, 6874, 6907, 6921, 7284, 7303, 7382, 7498, 7509, 7701, 7977, 8706, 8791, 8875, 8884, 9070, 9187

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Mathematica

cf62Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Length[ ContinuedFraction[ s][[2]]]]==62]; Select[Range[10000], cf62Q] (* Harvey P. Dale, Dec 14 2017 *)

Crossrefs

Cf. A003285.

Sequence in context: A239939 A179573 A264243 * A106816 A137714 A256677

Adjacent sequences: A020398 A020399 A020400 * A020402 A020403 A020404

Keyword

nonn

Author

David W. Wilson

Status

approved