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A031699 Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 21. 1
443, 1768, 3975, 7064, 11035, 15888, 21623, 28240, 35739, 44120, 53383, 63528, 74555, 86464, 99255, 112928, 127483, 142920, 159239, 176440, 194523, 204347, 213488, 224719, 233335, 254064, 275675, 298168, 321543, 345800, 370939, 396960 (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[400000], !IntegerQ[Sqrt[#]]&&Min[ContinuedFraction[Sqrt[#]][[2]]]==21&] (* Vincenzo Librandi, Jan 27 2012 *)
CROSSREFS
Sequence in context: A105980 A031519 A360827 * A158321 A293978 A345307
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 07:18 EDT 2024. Contains 371235 sequences. (Running on oeis4.)