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A020419 Numbers n such that continued fraction for sqrt(n) has period 80. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 20 01:38 EDT 2019. Contains 325168 sequences. (Running on oeis4.)