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A031691 Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 13. 1
171, 680, 1527, 2712, 4235, 6096, 8295, 10832, 13707, 16920, 20471, 24360, 28587, 31003, 33152, 36127, 38055, 43296, 48875, 54792, 61047, 67640, 71330, 74571, 81840, 89447, 97392, 105675, 106326, 114296, 114973, 123255, 123958, 128219, 132552 (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

Select[Range[200000], !IntegerQ[Sqrt[#]]&&Min[ContinuedFraction[Sqrt[#]][[2]]]==13&] (* Vincenzo Librandi, Feb 06 2012 *)

CROSSREFS

Sequence in context: A185837 A016057 A043407 * A158220 A079654 A220869

Adjacent sequences:  A031688 A031689 A031690 * A031692 A031693 A031694

KEYWORD

nonn,changed

AUTHOR

David W. Wilson

STATUS

approved

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Last modified July 27 05:26 EDT 2021. Contains 346305 sequences. (Running on oeis4.)