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A031784 Period of continued fraction for sqrt(n) contains exactly 16 ones. 0
421, 463, 541, 571, 613, 661, 673, 718, 719, 739, 763, 764, 814, 821, 883, 921, 937, 956, 981, 1061, 1081, 1099, 1117, 1121, 1125, 1135, 1174, 1237, 1249, 1252, 1270, 1390, 1413, 1423, 1441, 1459, 1468, 1477, 1511, 1583, 1651, 1657, 1661, 1676, 1723, 1724 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

cf16Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ ContinuedFraction[ s][[2]], 1]]==16]; Select[Range[2000], cf16Q] (* Harvey P. Dale, Mar 14 2018 *)

CROSSREFS

Sequence in context: A198163 A014890 A159589 * A268859 A051648 A217497

Adjacent sequences:  A031781 A031782 A031783 * A031785 A031786 A031787

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 30 23:39 EDT 2020. Contains 334747 sequences. (Running on oeis4.)