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A031698 Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 20. 2
101, 402, 903, 1604, 2505, 3606, 4907, 6408, 8109, 10010, 12111, 14412, 16913, 19614, 22515, 25616, 28917, 32418, 36119, 40020, 44121, 48422, 48862, 52923, 57624, 62525, 67626, 72927, 78428, 84129, 90030, 96131, 102432, 108933, 115634, 122535, 129636 (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]]]==20&] (* Vincenzo Librandi, Feb 06 2012 *)

CROSSREFS

Different from A055438.

Sequence in context: A327347 A062800 A323178 * A055438 A142692 A060012

Adjacent sequences:  A031695 A031696 A031697 * A031699 A031700 A031701

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified December 5 20:39 EST 2021. Contains 349558 sequences. (Running on oeis4.)