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Search: id:A033267
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| A033267 |
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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) = 4. |
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+0
2
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| 21, 24, 30, 33, 40, 42, 45, 48, 57, 60, 70, 72, 78, 85, 88, 93, 102, 112, 130, 133, 177, 190, 232, 253
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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D. Cox, "Primes of 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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CROSSREFS
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A subsequence of A000926.
Sequence in context: A157676 A066867 A111356 this_sequence A141734 A118578 A118568
Adjacent sequences: A033264 A033265 A033266 this_sequence A033268 A033269 A033270
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KEYWORD
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nonn,fini,full
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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