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Search: id:A001989
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| A001989 |
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Class numbers of quadratic fields.
(Formerly M3756 N1535)
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+0
1
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| 1, 1, 5, 7, 7, 7, 9, 53, 73, 83, 83, 83, 157, 157, 185, 185, 185, 1927, 2295, 2273, 5313, 5313, 7173, 9529, 18545, 18545, 18545, 18545, 22635, 22635, 66011, 121725, 344909, 344909
(list; graph; listen)
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OFFSET
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3,3
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REFERENCES
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D. H. Lehmer, E. Lehmer and D. Shanks, Integer sequences having prescribed quadratic character, Math. Comp., 24 (1970), 433-451.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
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Sequence in context: A093723 A065773 A114916 this_sequence A086056 A154475 A137755
Adjacent sequences: A001986 A001987 A001988 this_sequence A001990 A001991 A001992
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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