PrimeGrid's Challenge series continues with the "Equinox Challenge". Come join us as we usher in the fall and cooler temperatures with a 13 day marathon on the Woodall Prime Search project. The challenge will begin on the autumnal equinox, 23 Sep 2011 18:00 UTC, and end 06 Oct 2011 18:00 UTC. For more information, please see this forum post.
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