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 A020351 Numbers k such that the continued fraction for sqrt(k) has period 12. 2
 46, 76, 103, 127, 184, 213, 236, 239, 247, 263, 276, 295, 304, 329, 351, 355, 364, 366, 369, 386, 426, 428, 429, 460, 479, 512, 535, 558, 605, 609, 636, 640, 688, 708, 717, 734, 748, 767, 775, 802, 815, 820, 824, 832, 851, 864, 887, 995, 1027, 1068, 1071, 1077 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert P. P. McKone, Table of n, a(n) for n = 1..9999 MATHEMATICA Select[Range[1077], Length[Last[ContinuedFraction[Sqrt[#]]]] == 12 &] (* Robert P. P. McKone, Aug 27 2021, after Alonso del Arte *) CROSSREFS Contains A237611. Sequence in context: A167283 A085434 A245372 * A113691 A188598 A057454 Adjacent sequences: A020348 A020349 A020350 * A020352 A020353 A020354 KEYWORD nonn AUTHOR STATUS approved

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Last modified January 31 14:31 EST 2023. Contains 359975 sequences. (Running on oeis4.)