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A035120
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Discriminants of real quadratic number fields with class number >= 2.
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7
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40, 60, 65, 85, 104, 105, 120, 136, 140, 145, 156, 165, 168, 185, 204, 205, 220, 221, 229, 232, 257, 264, 265, 273, 280, 285, 296, 305, 312, 316, 321, 328, 345, 348, 357, 364, 365, 377, 380, 385, 401, 408, 424, 429, 440, 444, 445, 456, 460, 465, 469, 473
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history;
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OFFSET
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1,1
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REFERENCES
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H. Cohen, Advanced Topics in Computational Number Theory, Springer, 2000, p. 534.
H. Hasse, Number Theory, Springer-Verlag, NY, 1980, p. 576.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
X.-F. Roblot and Igor Schein, Hilbert class field of totally real fields of degree 2, 3 and 4.
Eric Weisstein's World of Mathematics, Class Number
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MATHEMATICA
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Needs["NumberTheory`NumberTheoryFunctions`"] (*then*) Flatten[Position[ClassNumber/@Range[600], 2, {1}]]
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CROSSREFS
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Cf. A003656, A094619.
Sequence in context: A100333 A116309 A126816 * A094619 A052475 A182205
Adjacent sequences: A035117 A035118 A035119 * A035121 A035122 A035123
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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More terms from Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), May 15 2002
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STATUS
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approved
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