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 A031720 Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 42. 1
 442, 1766, 3972, 7060, 11030, 15882, 21616, 28232, 35730, 44110, 53372, 63516, 74542, 86450, 99240, 112912, 127466, 142902, 159220, 176420, 194502, 213466, 233312, 254040, 275650, 298142, 321516, 345772, 370910, 396930, 423832, 451616, 480282, 509830, 540260, 571572, 603766, 636842, 670800, 705640, 741362, 777966, 815452, 853820, 855668 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 MATHEMATICA lt42Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Min[ContinuedFraction[s] [[2]]]] == 42]; Select[Range[452000], lt42Q] (* Harvey P. Dale, Jun 20 2017 *) CROSSREFS Sequence in context: A075268 A332531 A158322 * A069106 A094410 A236706 Adjacent sequences:  A031717 A031718 A031719 * A031721 A031722 A031723 KEYWORD nonn AUTHOR EXTENSIONS a(33)-a(45) from Charles R Greathouse IV, Aug 04 2017 STATUS approved

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Last modified May 24 05:06 EDT 2022. Contains 354005 sequences. (Running on oeis4.)