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A031816 Period of continued fraction for sqrt(n) contains exactly 48 ones. 0
3019, 3331, 3361, 3901, 4057, 4486, 4519, 5326, 5881, 5923, 6094, 6121, 6166, 6361, 6493, 6988, 7069, 7209, 7318, 7333, 7393, 7621, 7814, 8206, 8287, 8353, 8369, 8641, 8644, 8781, 8887, 9189, 9311, 9481, 9489, 9493, 9598, 10144, 10174, 10267, 10417 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..41.

MATHEMATICA

cf48Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ ContinuedFraction[ s] [[2]], 1]]==48]; Select[Range[11000], cf48Q] (* Harvey P. Dale, Dec 18 2015 *)

CROSSREFS

Sequence in context: A162606 A233963 A086746 * A252381 A186394 A236200

Adjacent sequences:  A031813 A031814 A031815 * A031817 A031818 A031819

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified September 17 06:16 EDT 2021. Contains 347478 sequences. (Running on oeis4.)