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 A031829 Period of continued fraction for sqrt(n) contains exactly 61 ones. 0
 16459, 31831, 55123, 57479, 64024, 69551, 73531, 80419, 91451, 92231, 96247, 108595, 110539, 115591, 122419, 141151, 154192, 156279, 157631, 159559, 159991, 160555, 165111, 165831, 166531, 166599, 173656, 183563, 186803, 187083, 188803 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA cf61Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ContinuedFraction[ s] [[2]], 1]]==61]; Select[Range[200000], cf61Q] (* Harvey P. Dale, Feb 01 2015 *) CROSSREFS Sequence in context: A076166 A168665 A283027 * A057680 A157796 A186848 Adjacent sequences:  A031826 A031827 A031828 * A031830 A031831 A031832 KEYWORD nonn AUTHOR STATUS approved

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Last modified December 12 18:24 EST 2018. Contains 318081 sequences. (Running on oeis4.)