Re: factor
- To: mathgroup@smc.vnet.net
- Subject: [mg12531] Re: factor
- From: "Allan Hayes" <hay@haystack.demon.cc.uk>
- Date: Sat, 23 May 1998 18:10:58 -0400
- References: <6jol0g$k67@smc.vnet.net>
William Moppett wrote in message <6jol0g$k67@smc.vnet.net>...
>help
>can anyone give me a factor of (10^71 - 1)/9 Mathematica 3.0 says it is
>not prime email
>wmoppet@nsw.bigpond.net.au
>
William,
The standard package
<<NumberTheory`FactorIntegerECM` may help.
But the notes say
FactorIntegerECM[2^128 + 1]
59649589127497217
took about three and a half hours on a workstation
--------------------
Allan Hayes
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