PrimeGrid's 2009 Challenge Series starts off with a fire cracker bang! Please come join us in the Chinese New Year, the Year of the Ox, for a 5 day (120 hour) Challenge on PrimeGrid's 321 Prime Search (LLR) application.

To participate in the Challenge, please select only the 321 Prime Search (LLR) project in your PrimeGrid preferences section. The challenge will begin 26 January 2009 18:00 UTC and end 31 January 2009 18:00 UTC. Application builds are available for Linux 32 bit and Windows 32 bit. These applications will be sent to 64 bit clients. As with all LLR application projects, there is no advantage of 64 bit over 32 bit.

ATTENTION: The primality program LLR is CPU intensive; so, it is vital to have a stable system with good cooling. It does not tolerate "even the slightest of errors." Please see this post for more details on how you can "stress test" your computer. WU's will take ~7-9 hours on fast/newer computers and 12+ hours on slower/older computers.