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A033268
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Numbers n such that every genus of binary quadratic forms of discriminant -4n consists of a single class and the class number h(-4n) = 8.
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4
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105, 120, 165, 168, 210, 240, 273, 280, 312, 330, 345, 357, 385, 408, 462, 520, 760
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OFFSET
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1,1
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REFERENCES
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David A. Cox, "Primes of the Form x^2 + n y^2", Wiley, 1989, p. 60.
G. B. Mathews, Theory of Numbers, Chelsea, no date, p. 263.
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LINKS
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PROG
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(PARI) ok(n)={my(u=quadclassunit(-4*n).cyc); #u==3 && !select(t->t<>2, u)} \\ Andrew Howroyd, Jun 09 2018
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CROSSREFS
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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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