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A001991
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Class numbers of quadratic fields.
(Formerly M0212 N0863)
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0
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2, 2, 2, 2, 2, 2, 2, 2, 46, 46, 46, 46, 46, 46, 406, 718, 950, 950, 950, 1698, 1698, 1698, 1698, 1698, 3990, 3990, 3990, 53510, 77970, 89478, 89478, 89478, 89478, 89478, 89478
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,1
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REFERENCES
| 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
| Index entries for sequences related to quadratic fields
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CROSSREFS
| Sequence in context: A123627 A171818 A175101 * A147793 A052298 A179938
Adjacent sequences: A001988 A001989 A001990 * A001992 A001993 A001994
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KEYWORD
| nonn,more
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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