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A031847
Period of continued fraction for sqrt(n) contains exactly 79 ones.
0
23479, 31411, 47875, 70087, 79003, 88183, 127327, 132271, 135991, 168479, 173215, 184747, 194539, 196471, 205771, 208555, 227287, 242008, 256583, 269107, 270751, 283624, 313847, 314375, 316543, 324719, 327611, 343312, 344259, 345119, 353659
OFFSET
1,1
MATHEMATICA
cf79Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ ContinuedFraction[ s][[2]], 1]]==79]; Select[Range[360000], cf79Q] (* Harvey P. Dale, Dec 14 2015 *)
CROSSREFS
Sequence in context: A246891 A189656 A204074 * A237528 A234441 A253310
KEYWORD
nonn
STATUS
approved