A031779 Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 11 ones.

1075, 1675, 2183, 2623, 2783, 2871, 3075, 3224, 3256, 3551, 3915, 4675, 5656, 6808, 6815, 7599, 7663, 7987, 8299, 8399, 8695, 8995, 9271, 10672, 10855, 11395, 11403, 11919, 12728, 13407, 14608, 14672, 15023, 15568, 15640, 15768, 16119, 16856, 17043

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Programs

Mathematica

oQ[n_]:=Module[{sqn=Sqrt[n]},!IntegerQ[sqn]&&Count[ ContinuedFraction[ sqn][[2]],1]==11]; Select[Range[20000],oQ] (* Harvey P. Dale, Nov 10 2011 *)