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A031823 Period of continued fraction for sqrt(n) contains exactly 55 ones. 0
39407, 45199, 48151, 52471, 54199, 56023, 71839, 72851, 74104, 82315, 90875, 91687, 101263, 112487, 113375, 114119, 115427, 118255, 123823, 127495, 129431, 130471, 131895, 140995, 142839, 145839, 156339, 160547, 163291, 173336, 176839, 184483 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..32.

MATHEMATICA

cf55Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ContinuedFraction[s][[2]], 1]]==55]; Select[Range[185000], cf55Q] (* Harvey P. Dale, Dec 15 2020 *)

CROSSREFS

Sequence in context: A203875 A252604 A340062 * A205035 A205283 A251354

Adjacent sequences:  A031820 A031821 A031822 * A031824 A031825 A031826

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified October 25 20:31 EDT 2021. Contains 348256 sequences. (Running on oeis4.)