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 A031790 Period of continued fraction for sqrt(n) contains exactly 22 ones. 0
 991, 1021, 1303, 1324, 1357, 1453, 1543, 1569, 1597, 1619, 1689, 1789, 1804, 1822, 1948, 1993, 2053, 2104, 2174, 2203, 2253, 2361, 2381, 2413, 2458, 2503, 2654, 2657, 2729, 2761, 2794, 2803, 2861, 2887, 2893, 2899, 2973, 2979, 2983, 2998, 3085, 3091 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA cf22Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Count[ContinuedFraction[s][[2]], 1]]==22]; Select[Range[3500], cf22Q] (* Harvey P. Dale, Feb 18 2015 *) CROSSREFS Sequence in context: A119057 A218401 A053393 * A137703 A255098 A155509 Adjacent sequences:  A031787 A031788 A031789 * A031791 A031792 A031793 KEYWORD nonn AUTHOR STATUS approved

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