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A031839 Period of continued fraction for sqrt(n) contains exactly 71 ones. 0
16039, 45571, 49051, 59911, 70375, 97219, 120143, 121903, 122931, 125623, 129667, 136024, 142091, 144664, 145867, 147431, 148391, 152056, 153064, 162403, 163903, 178551, 179767, 180583, 186359, 191287, 216143, 218023, 226615, 227971, 231835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..31.

MATHEMATICA

cf71Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ContinuedFraction[s][[2]], 1]]==71]; Select[Range[240000], cf71Q] (* Harvey P. Dale, Dec 26 2018 *)

CROSSREFS

Sequence in context: A204942 A163112 A202420 * A062674 A274680 A286662

Adjacent sequences:  A031836 A031837 A031838 * A031840 A031841 A031842

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified January 18 13:38 EST 2022. Contains 350455 sequences. (Running on oeis4.)