A020419 Numbers k such that the continued fraction for sqrt(k) has period 80.

1759, 1981, 2206, 2764, 2989, 3559, 3628, 3694, 3817, 3868, 3921, 4041, 4333, 5006, 5293, 5294, 5407, 5647, 5877, 6193, 6281, 6718, 6847, 6892, 7660, 8039, 8137, 8359, 8561, 8596, 9487, 9788, 9989, 10014, 10495, 10579, 10697, 10737, 10882, 11006

Offset

1,1

Links

Table of n, a(n) for n=1..40.

Mathematica

Select[Range[2000], Length[ContinuedFraction[Sqrt[#]][[2]]] == 80 &] (* Alonso del Arte, Jun 23 2018 *)

Crossrefs

Sequence in context: A213459 A186012 A031802 * A141287 A238050 A213804

Adjacent sequences: A020416 A020417 A020418 * A020420 A020421 A020422

Keyword

nonn

Author

David W. Wilson

Status

approved