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A020350 Numbers k such that the continued fraction for sqrt(k) has period 11. 0
61, 97, 233, 298, 317, 554, 757, 773, 794, 797, 1322, 1385, 1429, 1625, 1658, 1730, 1769, 1865, 1973, 2069, 2081, 2218, 2249, 2285, 2357, 2465, 2690, 2890, 2941, 2986, 3233, 3242, 3341, 3538, 3545, 3986, 4250, 4274, 4553, 4597, 4610, 4649, 4682, 4889 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..44.

MATHEMATICA

cf11Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Length[ ContinuedFraction[ s][[2]]]]==11]; Select[Range[5000], cf11Q] (* Harvey P. Dale, Mar 28 2019 *)

CROSSREFS

Sequence in context: A045562 A104229 A088787 * A142108 A033239 A106390

Adjacent sequences: A020347 A020348 A020349 * A020351 A020352 A020353

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified January 31 14:49 EST 2023. Contains 359975 sequences. (Running on oeis4.)