On 24 Feb 2011, 17:27:31 UTC, PrimeGrid?s PRPNet found the largest known generalized Woodall prime:

404882*43^404882-1

The prime is 661,368 digits long and enters Chris Caldwell's <b><a href="http://primes.utm.edu/primes" rel="nofollow">The Largest Known Primes Database</a></b> ranked 1st for generalized Woodall primes and 71st overall.

The discovery was made by <b>Ricky L. Hubbard</b> of the United States using an AMD Athlon II X4 635 @ 2.90GHz with 8GB RAM, running Windows 7. This computer took about 4 hours and 15 minutes to complete the probable prime test using pfgw64 and a little over 30 hours 3 minutes to complete the primality test again using pfgw64. Ricky is a member of the <b><a href="http://www.primegrid.com/team_display.php?teamid=14" rel="nofollow">AMD Users</a></b> Team.

For more details, please see the <b><a href="http://www.primegrid.com/download/gw43-404882.pdf" rel="nofollow">official announcement</a></b>.