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A329182
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Negative discriminants with form class group isomorphic to C_2 X C_2 (negated).
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3
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84, 96, 120, 132, 160, 168, 180, 192, 195, 228, 240, 280, 288, 312, 315, 340, 352, 372, 408, 435, 448, 483, 520, 532, 555, 595, 627, 708, 715, 760, 795, 928, 1012, 1435
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OFFSET
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1,1
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COMMENTS
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This sequence is finite and this is the full list.
Equivalently, negative discriminants of orders whose class group is isomorphic to C_2 X C_2 (negated). - Jianing Song, May 17 2021
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LINKS
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PROG
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(PARI) isA329182(d) = (d>0) && ((d%4==0)||(d%4==3)) && quadclassunit(-d)[2]==[2, 2] \\ Jianing Song, May 17 2021
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CROSSREFS
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Cf. A133675 (negative discriminants with form class group isomorphic to the trivial group), A322710 (isomorphic to C_2), A328825 (isomorphic to C_3), this sequence (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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