>
> > At Paul Zimmerman's ECM page,
> > http://www.loria.fr/~zimmerma/records/ecmnet.html
> > the optimal B1 value listed for finding 50-digit factors is 43000000, but
> > George's ECM factoring page uses 44000000 for the same purpose. Is one of
> > them wrong, or is there a reason for the difference?
>
> If I count the zeros right, these are 43 million and 44 million.
> The function being minimized, namely
>
> probability of finding a 50-digit factor on one curve, given that such exists
> -----------------------------------------------------------------------------
> time per curve
>
> is flat near its minimum. Implementation and platform differences
> can obviously affect the denominator (time per curve).
> The stage-2 strategy affects the numerator. The two optimal B1's
> are close enough to be considered the same.
>
>
I was wondering about the choice of B1 and B2. Is it possible to ellaborate on the
choice
of these parameters function of the size of expected factors - without taking too much
of your
time ?
Thank you,
Sincerely
Preda Mihailescu
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