
Largest Known Prime Number Discovered
Posted:
Feb 11, 2013 11:37 AM



******************************** See http://www.mersenne.org/various/57885161.htm ********************************
GIMPS Project Discovers Largest Known Prime Number, 257,885,1611 [2 to the 57885161 th power minus 1]
ORLANDO, Florida  On January 25th at 23:30:26 UTC, the largest known prime number, 257,885,1611, was discovered on Great Internet Mersenne Prime Search (GIMPS) volunteer Curtis Cooper's computer. The new prime number, 2 multiplied by itself 57,885,161 times, less one, has 17,425,170 digits. With 360,000 CPUs peaking at 150 trillion calculations per second, 17thyear GIMPS is the longest continuouslyrunning global "grassroots supercomputing"[1] project in Internet history.
Dr. Cooper is a professor at the University of Central Missouri. This is the third record prime for Dr. Cooper and his University. Their first record prime was discovered in 2005, eclipsed by their second record in 2006. Computers at UCLA broke that record in 2008 with a 12,978,189 digit prime number. UCLA held the record until University of Central Missouri reclaimed the world record with this discovery. The new primality proof took 39 days of nonstop computing on one of the university's PCs. Dr. Cooper and the University of Central Missouri are the largest individual contributors to the project. The discovery is eligible for a $3,000 GIMPS research discovery award.
See more at http://www.mersenne.org/various/57885161.htm
[1]Science (American Association for the Advancement of Science), May 6, 2005 p 810.
 Jerry P. Becker Dept. of Curriculum & Instruction Southern Illinois University 625 Wham Drive Mail Code 4610 Carbondale, IL 629014610 Phone: (618) 4534241 [O] (618) 4578903 [H] Fax: (618) 4534244 Email: jbecker@siu.edu

