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A031720
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Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 42.
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1
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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
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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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 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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