Free-DC
05-12-2010, 12:26 PM
Those with triskaidekaphobia can rest at ease tonight!!! A generalized Woodall prime for base 13 has been discovered!!! The prime was found in PrimeGrid's PRPNet and is the largest known generalized Woodall prime:
563528*13563528-1 The prime is 627,745 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes/) ranked 1st for generalized Woodall primes and 65th overall. It is the largest non-base 2/non-generalized Fermat prime ever found. The discovery was made by Lennart Vogel (lennart SM5YMT (http://www.primegrid.com/show_user.php?userid=7989)) of Sweden using an Intel Q6600 @ 2.4 GHz with 4 GB RAM. This computer took about 3 hours and 54 minutes to complete the probable prime test. It took just over 30 hours to prove primality. For more details, please see the official announcement (http://www.primegrid.com/download/gw13-563528.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=2501)
563528*13563528-1 The prime is 627,745 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes/) ranked 1st for generalized Woodall primes and 65th overall. It is the largest non-base 2/non-generalized Fermat prime ever found. The discovery was made by Lennart Vogel (lennart SM5YMT (http://www.primegrid.com/show_user.php?userid=7989)) of Sweden using an Intel Q6600 @ 2.4 GHz with 4 GB RAM. This computer took about 3 hours and 54 minutes to complete the probable prime test. It took just over 30 hours to prove primality. For more details, please see the official announcement (http://www.primegrid.com/download/gw13-563528.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=2501)