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A344408
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Positive discriminants of orders with class number 2.
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2
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40, 60, 65, 85, 96, 104, 105, 120, 136, 140, 156, 160, 165, 168, 185, 192, 200, 204, 205, 220, 221, 224, 232, 240, 252, 260, 264, 265, 273, 280, 285, 288, 296, 300, 305, 312, 320, 325, 336, 340, 345, 348, 352, 357, 360, 364, 365, 377, 380, 384, 385, 408
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OFFSET
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1,1
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COMMENTS
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Also positive discriminants of orders with class group isomorphic to C_2.
The fundamental terms are listed in A094619.
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LINKS
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PROG
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(PARI) isA344408(d) = (d>0) && !issquare(d) && ((d%4==0)||(d%4==1)) && quadclassunit(d)[2]==[2]
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CROSSREFS
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Cf. A133315 (positive discriminants of orders with class number 1), this sequence (class number 2), A344409 (class number 3).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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