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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
Select[Range, NumberFieldDiscriminant@Sqrt[#] == # && NumberFieldClassNumber@Sqrt[#] == 3 &] (* Arkadiusz Wesolowski, Oct 22 2012 *)
Cf. A003656, A094619, A094613-A094614, A218156-A218160.
Sequence in context: A062589 A250235 A250236 * A250237 A112847 A157348
Adjacent sequences: A094609 A094610 A094611 * A094613 A094614 A094615
Eric W. Weisstein, May 14 2004
Edited by N. J. A. Sloane, May 01 2010