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A094612 Fundamental discriminants of real quadratic number fields with class number 3. 13
229, 257, 316, 321, 469, 473, 568, 733, 761, 892, 993, 1016, 1101, 1229, 1257, 1304, 1373, 1436, 1489, 1509, 1772, 1901, 1929, 1957, 2021, 2089, 2101, 2177, 2213, 2429, 2557, 2589, 2636, 2677, 2713, 2777, 2857, 2917, 2981, 3173, 3221, 3229, 3261, 3356, 3569 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

Eric Weisstein's World of Mathematics, Class Number

Index entries for sequences related to quadratic fields

MATHEMATICA

Select[Range[3569], NumberFieldDiscriminant@Sqrt[#] == # && NumberFieldClassNumber@Sqrt[#] == 3 &] (* Arkadiusz Wesolowski, Oct 22 2012 *)

CROSSREFS

Cf. A003656, A094619, A094613-A094614, A218156-A218160.

Sequence in context: A062589 A250235 A250236 * A250237 A112847 A157348

Adjacent sequences:  A094609 A094610 A094611 * A094613 A094614 A094615

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, May 14 2004

EXTENSIONS

Edited by N. J. A. Sloane, May 01 2010

STATUS

approved

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Last modified March 27 13:47 EDT 2017. Contains 284176 sequences.