A196923 Values of fundamental discriminant -d where number of ideal classes Q(sqrt(-d)) is at most two.

3, 4, 7, 8, 11, 15, 19, 20, 24, 35, 40, 43, 51, 52, 67, 88, 91, 115, 123, 148, 163, 187, 232, 267, 403, 427

Offset: 1

Author

Artur Jasinski, Oct 07 2011

Keywords

• nonn
• fini
• full

Comments

Equals A014602 union A014603. - Michel Marcus, Nov 02 2013

Links

• A. Schinzel, Solution to a Problem of Lubelski and an Improvement of a Theorem of His, Bull. Pol. Acad. Sci. Math. Vol. 59 No 2 2011 pp. 115-119.
• H. M. Stark, On complex quadratic fields with class number two, Math. Comp. 29, 1975, pp. 289-302.