On Thu, 09 Nov 2006 07:24:18 -0500, [EMAIL PROTECTED]  
<[EMAIL PROTECTED]> wrote:

> I was wondering does anyone know of any good executable computer  
> programs that can perform Big Digit arithmetic precision to factor very  
> large numbers?
>
>
> I need an executable program as good as Prime95 (GIMPS), that can factor  
> a very large integer that has from 200 to 300 digits in it.

Well, you won't find anything nearly as fast as Prime95, and I doubt that  
there is any general-purpose factorization program that can routinely  
handle 200 digit numbers within a single lifetime. There are programs that  
are pretty good at factorization, however, and one of them is both free  
and portable, namely PARI/GP. You can find it at  
http://pari.math.u-bordeaux.fr/ . There's a precompiled version for  
Windows that might come close to what you are looking for.

Regards, Bill
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