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A001985
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Class numbers of quadratic fields.
(Formerly M2669 N1068)
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0
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3, 7, 19, 25, 51, 109, 153, 213, 289, 1121, 1121, 1121, 3997, 7457, 12017, 12719, 20299, 24503, 24503, 25817, 25817, 128755, 128755, 219207, 456929, 456929, 761619, 883537
(list;
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history;
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OFFSET
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3,1
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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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LINKS
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Table of n, a(n) for n=3..30.
Index entries for sequences related to quadratic fields
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CROSSREFS
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Sequence in context: A127925 A032388 A050866 * A203321 A203319 A164097
Adjacent sequences: A001982 A001983 A001984 * A001986 A001987 A001988
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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