> I would like to look for a factor of a mersenne prime in a specific area.
> For example, for a mersenne exponent of say 40,000,000. I want to use the
> Prime95b program, (v19 I guess), to search for a factor in a specific range
> from, say, 2^40 to 2^50. I do not understand the ECM factoring instuctions
> included with Prime95.
For this targeted a test, you might want to use trial factoring
simply edit to worktodo.ini file adding the following line
Factor=a,b
Where a is the mersenne exponent, and 2^b is the limit trial factored to.
you can override the default trial factoring depth with the line
FactorOveride=n
where n is the power of 2 that you want it to stop at.
(I think that is how it is spelled, see undoc.txt) (a rather ironic title
in my opinion)
> I don't understand how to set the ECM= paramaters to accomplish my goal.
>
> It is my understanding that one can use ECM or 2^p-1 factoring with V19.
(I think you mean P-1 factoring).
Yes, but ECM wouldn't be best for such a targeted search (as I understand it).
-Lucas
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