On 21 Dec 2007, 10:09:30 UTC, PrimeGrid’s Woodall Prime Search found the 33rd and largest known to date Woodall prime: 3752948*2^3752948-1

The prime is 1,129,757 digits long and enters The Largest Known Primes Database ranked 1st for Woodall primes and 13th overall. It’s the first found mega-digit prime using LLR.

The discovery was made by Matthew J. Thompson of the United States using an Intel P4 @ 2.8 GHz with 512MB RAM. This computer took almost 15 hours and 11 minutes to complete the primality test.

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