http://www.mersenne.org/freesoft.htm
''A Mersenne prime is a prime number of the form 2P-1. There are 41 known Mersenne primes. The first few values of P which yield a Mersenne prime are 2, 3, 5, 7, 13 (the corresponding primes are 3, 7, 31, 127, 8191)." The Mersenne Prime Search uses the unused CPU cycles to search for more Mersenne Prime numbers. So far they have found 3 more beyond the original
41. There is a prize of $100,000 to the group that finds a ten million digit prime number. More on how the prize would be divided can be found at
http://www.mersenne.org/prize.htm
OS/2: Max Alekseyev has ported the Linux version to OS/2. Download his os2v2414.zip(1.2MB) zipped executable. Version 24.14, last updated February 3, 2006. ftp://mersenne.org/gimps/os2v2414.zip
Source: OS2VOICE