On May 15, 2004, Josh Findley discovered the largest known prime number, which is and consists of 7,235,733 decimal digits. You may view this wondrous object and contemplate it at your leisure. Be the first to find a prime number that consists of at least 10,000,000 decimal digits and win $100,000.
Update, 9/1/2007: the largest known prime number is now 2^32,582,657 - 1. It consists of 9,808,358 decimal digits and was discovered on 9/4/2006. This prime is just shy of 10,000,000 digits, so the 100 grand can still be yours!