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A020406 Numbers n such that continued fraction for sqrt(n) has period 67. 1
1381, 1789, 2521, 3754, 3994, 5953, 6389, 7349, 7765, 7801, 8297, 8842, 9274, 10253, 12413, 14458, 15349, 15749, 16073, 16229, 19073, 21485, 22433, 24106, 24317, 24506, 24538, 24929, 25577, 25706, 26170, 26773, 26954, 28018, 28345, 30197, 32218, 32290 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

MATHEMATICA

cf67Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Length[ ContinuedFraction[ s][[2]]]]==67]; Select[Range[33000], cf67Q] (* Harvey P. Dale, Sep 21 2018 *)

CROSSREFS

Sequence in context: A051114 A139667 A031796 * A277632 A241483 A134671

Adjacent sequences:  A020403 A020404 A020405 * A020407 A020408 A020409

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified October 23 17:19 EDT 2019. Contains 328373 sequences. (Running on oeis4.)