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Old 2003-08-27, 08:04   #1
andi314's Avatar
Nov 2002

2×37 Posts
Default New ECM-server available

I have set up a new ECM server !!

port: 8194
available composites: numbers of form 2^n+1 and 2^n-1

If there are any problems please contact me at

Statistics are now available under:

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Old 2003-08-31, 08:22   #2
andi314's Avatar
Nov 2002

7410 Posts

to Martin Schroeder, aka McBryce !! He was the first who found a factor of a composite mersenne number on my server at

The factor is
M( 9504 )C: 2776202386436268283691901876771457 (34 digits)
found with B1=250000 and
sigma= -176653509

Will Edgington has been informed so this will show up in the next release of lowM.txt. The remaining 714 digit composite is now available in the ecm server. More helpers are welcome - smh has put together the following to make it easy to join:

Originally Posted by smh
I've put a zipfile (~800K) with the ecmclient and ecm.exe for various processors online here

Before you run ecmclient, put the right ecm.exe in the same folder and set the parameters in ecmclient.cfg
if you need any help please contact me at

So now i'm interessted who will be the next one, who finds a factor of M(X) or P(X)..

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Old 2003-08-31, 10:10   #3
smh's Avatar
Oct 2002

4A516 Posts

Are the numbers on your server the full M or P number or are they divided by known factors?

I ask because on a P4 (and probably other processors) prime95 is much faster on M numbers, unless you can take advantage of a lot of known factors
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Old 2003-08-31, 11:22   #4
andi314's Avatar
Nov 2002

2·37 Posts

Most of the numbers are P(X) but there are also some M(X).
And all of this numbers aren't full numbers anymore, they are divided by known factors.

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