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A322710
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Negative discriminants with form class number 2 (negated).
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5
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15, 20, 24, 32, 35, 36, 40, 48, 51, 52, 60, 64, 72, 75, 88, 91, 99, 100, 112, 115, 123, 147, 148, 187, 232, 235, 267, 403, 427
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OFFSET
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1,1
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COMMENTS
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This is the full sequence.
The j-invariants for these discriminants are quadratic integers. See the links below for a full list.
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LINKS
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PROG
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(PARI) for(n=1, 500, if((-n)%4<=1&&quadclassunit(-n)[1]==2, print1(n, ", ")))
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CROSSREFS
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Cf. A133675 (negative discriminants with form class group isomorphic to the trivial group), this sequence (isomorphic to C_2), A328825 (isomorphic to C_3), A329182 (isomorphic to C_2 X C_2), A330219 (isomorphic to C_4).
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KEYWORD
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nonn,fini,full
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AUTHOR
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STATUS
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approved
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