Does anyone have a table of the class numbers ($h_n$) of cyclotomic fields (upto say, n = 250-300 for $\mathbb Q(\mu_n)$)?

I can find tables for the relative class number ($h_n^-$) in various places like Washington's book and I can also find tables for class numbers of $\mathbb Q(\zeta_p)$ for $p$ prime. However, I am really interested in the class numbers for $n$ composite and I don't seem to be able to locate any. Probably someone with better googling skills could locate it...

Sage also takes too long to calculate class numbers after a point.

Alternatively, are there any results known on what $h_n^+ = h_n/h_n^-$ can be for the range $n \leq 300$?

I would appreciate it if the table were in a format where I could easily copy paste from.

  • 1
    $\begingroup$ No one knows how to compute these class numbers. Washington's book has tables containing what are believed to be plus class numbers based on computations by Schoof. $\endgroup$ – Franz Lemmermeyer Mar 5 '18 at 19:13

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