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A196923 Values of fundamental discriminant -d where number of ideal classes Q(sqrt(-d)) is at most two. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
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.
CROSSREFS
Sequence in context: A179016 A003657 A003644 * A192051 A033195 A050032
KEYWORD
nonn,fini,full
AUTHOR
Artur Jasinski, Oct 07 2011
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)