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Search: id:A006203
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| A006203 |
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Discriminants of imaginary quadratic fields with class number 3 (negated).
(Formerly M5131)
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+0
31
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| 23, 31, 59, 83, 107, 139, 211, 283, 307, 331, 379, 499, 547, 643, 883, 907
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also n such that Q(sqrt(-n)) has class number 3.
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
H. Cohen, Course in Computational Alg. No. Theory, Springer, 1993, p. 514.
J. M. Masley, Where are the number fields with small class number?, pp. 221-242 of Number Theory Carbondale 1979, Lect. Notes Math. 751 (1982).
Heegner K., 1952. Diophantische Analysis und Modulfunktionen. Matematische Zaitschrift Vol. 56. p. 253. [From Artur Jasinski (grafix(AT)csl.pl), Oct 21 2008]
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to quadratic fields
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PROGRAM
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For PARI code see A005847.
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CROSSREFS
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Cf. A013658, A014602, A014603, A046002, ..., A046020. Cf. also A003173, A005847, ...
Sequence in context: A064792 A030670 A030680 this_sequence A153635 A052160 A165985
Adjacent sequences: A006200 A006201 A006202 this_sequence A006204 A006205 A006206
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KEYWORD
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fini,nonn,full,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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