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A031846 Period of continued fraction for sqrt(n) contains exactly 78 ones. 0
6694, 7219, 7981, 8809, 9199, 9391, 11239, 12229, 13441, 14452, 14881, 15139, 15214, 15901, 16681, 17839, 17902, 18307, 18373, 18583, 18671, 18862, 18958, 18961, 20113, 20569, 20833, 20983, 21309, 21429, 21501, 21673, 21729, 21748, 22411, 23038, 23039 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

cf78Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], False, Count[ ContinuedFraction[ s][[2]], 1]==78]]; Select[Range[25000], cf78Q] (* Harvey P. Dale, May 24 2014 *)

CROSSREFS

Sequence in context: A046410 A098936 A206008 * A289516 A239565 A234242

Adjacent sequences:  A031843 A031844 A031845 * A031847 A031848 A031849

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified June 25 12:01 EDT 2019. Contains 324352 sequences. (Running on oeis4.)