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Finally!!! A significant find during a Challenge. On 24 Apr 2010 11:40:07 UTC, PrimeGrid's 321 Prime Search found another Mega Prime:
3*2^6090515-1
The prime is 1,833,429 digits long and enters Chris Caldwell's <a href="http://primes.utm.edu/primes/" rel="nofollow">The Largest Known Primes Database</a> ranked 17th overall. This is the second mega prime for the 3*2^n-1 form, and it is the third largest found mega-digit prime using LLR. The discovery was made by David Mumper (<a href="http://www.primegrid.com/show_user.php?userid=51439" rel="nofollow">Mumps</a>) of the United States using an AMD Quad-Core Opteron 2378 with 8 GB RAM running Linux. This computer took just over 15 hours 24 minutes to complete the primality test. David is a member of the <a href="http://www.primegrid.com/team_display.php?teamid=189" rel="nofollow">SETI.USA</a> team. <a href="http://www.primegrid.com/download/321-6090515.pdf" rel="nofollow">Official announcement</a> and <a href="http://www.primegrid.com/download/321n6090515.pdf" rel="nofollow">decimal representation</a> of the prime.

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Source: PrimeGrid: News

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