There is a bug in the Cremona tables -- he actually missed some
curves, and I think that is one of them.  I need to update the
SAGE cremona table to match the latest official version of the tables.
I meant to do this but just haven't had the time.
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On 6/20/07, Chris Wuthrich <christian.wuthrich@gmail.com> wrote:
>  There is a curve 90288bb1 in Cremona's table (magma has it also in
> its tables), but sage does not know it ?? Why ?
>  On the other hand sage knows a curve of conductor 119997 in the
> tables, which made me think that the upper limit on the conductor was
> 120'000.
>
>  Chris.