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This project has been rather successful: it has already found a total of nine Mersenne Primes , each of which was the largest known prime at the time of discovery. The largest known prime As Of December 2005 is 230,402,457 − 1 (or M30402457 in short). This prime was discovered on December 15 , 2005 on a 700 PC cluster operated by Steven Boone and Curtis Cooper at the Central Missouri State University . Refer to the article on Mersenne Prime numbers for the complete list of GIMPS successes. As of December 2005, GIMPS has a sustained throughput of approximately 18 TFLOPS , earning the GIMPS Virtual Computer a firm place among the most powerful Supercomputer s in the world. Although the GIMPS software has its source code available, technically it is not Open Source , since it has a restriction which most open source/ Free Software groups find unacceptable – users must abide by the prize distribution terms. This restriction will become meaningless when the EFF prizes are claimed. For open source alternatives, Glucas and Mlucas are both licensed under the GPL. PRIMES FOUND All primes are in the form M''n'', where ''n'' is the exponent. The prime number itself is . SEE ALSO
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