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Search: id:A061653
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| A061653 |
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Class number of cyclotomic field Q(zeta_n). |
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+0
5
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| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 8, 1, 9, 1, 1, 1, 1, 1, 37, 1, 2, 1, 121, 1, 211, 1, 1, 3, 695, 1, 43
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OFFSET
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1,22
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COMMENT
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Note that if n = 2 (mod 4) Q(zeta_n) is the same field as Q(zeta_{n/2}).
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REFERENCES
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L. C. Washington, Introduction to Cyclotomic Fields, Springer, p. 353.
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CROSSREFS
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Cf. A035115, A055513, A061494, A005848.
Sequence in context: A046556 A046535 A135939 this_sequence A069226 A016565 A051714
Adjacent sequences: A061650 A061651 A061652 this_sequence A061654 A061655 A061656
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KEYWORD
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nonn,easy,nice,more
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AUTHOR
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njas, Jun 16 2001
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EXTENSIONS
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Washington gives an extensive table on pp. 353-360.
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