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 A031820 Period of continued fraction for sqrt(n) contains exactly 52 ones. 0
 3271, 3334, 3829, 4339, 4621, 4894, 5401, 5569, 5761, 5806, 6367, 6379, 6646, 6964, 7341, 7357, 7597, 8317, 8467, 9069, 9121, 9463, 9549, 9631, 9721, 9892, 10717, 10753, 10771, 10996, 11233, 11489, 11689, 11824, 11833, 12157, 12329, 12454, 12611, 12781 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..40. MATHEMATICA cf52Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ ContinuedFraction[ s][[2]], 1]]==52]; Select[Range[13000], cf52Q] (* Harvey P. Dale, Jul 02 2017 *) CROSSREFS Sequence in context: A101706 A251273 A184204 * A048959 A353140 A237085 Adjacent sequences: A031817 A031818 A031819 * A031821 A031822 A031823 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified May 31 19:41 EDT 2023. Contains 363068 sequences. (Running on oeis4.)