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A031783 Period of continued fraction for sqrt(n) contains exactly 15 ones. 0
871, 2675, 3683, 4819, 5863, 6731, 8056, 8827, 9592, 9971, 10207, 10323, 12019, 12455, 12584, 15224, 15563, 15696, 16168, 16536, 16808, 17155, 17235, 18535, 19039, 20923, 20995, 21255, 21576, 22608, 24464, 24495, 24883, 26151, 26207, 26827, 26967 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..37.

MATHEMATICA

cf15Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ContinuedFraction[ s] [[2]], 1]]==15]; Select[Range[27000], cf15Q] (* Harvey P. Dale, May 09 2021 *)

CROSSREFS

Sequence in context: A205426 A035855 A317806 * A253167 A214285 A251841

Adjacent sequences:  A031780 A031781 A031782 * A031784 A031785 A031786

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified October 21 09:55 EDT 2021. Contains 348150 sequences. (Running on oeis4.)