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# GIMPS milestones

The Great Internet Mersenne Prime Search has already discovered thirteen Mersenne primes!

## Major Milestones

Date Milestone
2010-01-07 All exponents below 20,000,000 double-checked.
2009-04-12 Prime M46 = M(42643801) discovered!!
2009-04-08 All exponents below M42 = M(25964951) tested at least once.
2008-09-06 Prime M45 = M(37156667) discovered!!
2008-08-23 Prime M47 = M(43112609) discovered!!
2006-09-04 Prime M44 = M(32582657) discovered!!
2006-07-10 Double-checking proves M39 = M(13466917) is the 39th Mersenne prime.
2005-12-15 Prime M43 = M(30402457) discovered!!
2005-02-18 Prime M42 = M(25964951) discovered!!
2004-05-15 Prime M41 = M(24036583) discovered!
2003-11-17 Prime M40 = M(20996011) discovered!
2003-02-02 Double-checking proves M38 = M(6972593) is the 38th Mersenne prime.
2001-11-14 Prime M39 = M(13466917) discovered!
2000-05-19 Double-checking proves M36 = M(2976221) and M37 = M(3021377) are the 36th and 37th Mersenne primes.
1999-06-01 Prime M38 = M(6972593) discovered!
1998-12-18 Double-checking proves M35 = M(1398269) is the 35th Mersenne prime.
1998-03-29 Double-checking proves M34 = M(1257787) is the 34th Mersenne prime.
1998-01-27 Prime M37 = M(3021377) discovered!
1997-08-30 Double-checking proves M32 = M(756839) and M33 = M(859433) are the 32nd and 33rd Mersenne primes.
1997-08-24 Prime M36 = M(2976221) discovered!
1996-11-13 Prime M35 = M(1398269) discovered!
1996-3rd Q. Double-checking proves M31 = M(216091) is the 31st Mersenne prime.

## Minor Milestones

 2009-10-30 All exponents below 19,000,000 double-checked. 2009-02-23 All exponents below 18,000,000 double-checked. 2009-02-23 All exponents below M41 = M(24036583) tested at least once. 2008-07-08 All exponents below 17,000,000 double-checked. 2008-07-04 All exponents below M40 = M(20996011) tested at least once. 2007-12-31 All exponents below 20,000,000 tested at least once. 2007-12-03 All exponents below 16,000,000 double-checked. 2007-04-23 All exponents below 15,000,000 double-checked. 2006-09-11 All exponents below 14,000,000 double-checked. 2006-06-13 All exponents below 13,000,000 double-checked. 2006-03-01 All exponents below 17,000,000 tested at least once. 2005-12-24 All exponents below 16,000,000 tested at least once. 2005-04-26 All exponents below 10,000,000 double-checked. 2005-02-23 All exponents below 15,000,000 tested at least once. 2004-10-03 All exponents below M39 = M(13466917) tested at least once. 2004-09-17 All exponents below 9,000,000 double-checked. 2004-03-09 All exponents below 12,000,000 tested at least once. 2004-02-23 All exponents below 8,000,000 double-checked. 2002-12-16 All exponents less than 6,000,000 double-checked. 2002-07-19 All exponents below 10,000,000 tested at least once. 2002-05-02 All exponents less than 5,000,000 double-checked. 2002-04-15 All exponents below 9,000,000 tested at least once. 2001-09-25 All exponents below 8,000,000 tested at least once. 2001-07-25 All exponents below M38 = M(6972593) tested at least once. 2001-05-20 All exponents less than 4,000,000 double-checked. 2001-04-06 First ten million digits number sucessfully double-checked. 2001-04-01 All exponents less than 6,000,000 tested at least once. 2000-09-25 First ten million digits number tested for primality. 2000-03-15 All exponents less than 5,000,000 tested at least once. 1999-10-16 All exponents less than 2,000,000 double-checked. 1999-08-19 All exponents less than 4,000,000 tested at least once. 1998-12-26 All Mersenne numbers less than 1,000,000 digits tested at least once. 1998-09-26 All exponents below M37 = M(3021377) tested at least once. 1998-09-19 All exponents below M36 = M(2976221) tested at least once. 1998-03-05 All exponents below 2,000,000 tested at least once. 1997-10-30 All exponents below 1,000,000 double-checked. 1997-10-11 All exponents below M35 = M(1398269) tested at least once. 1997-08-28 All exponents below M34 = M(1257787) tested at least once. 1997-05-26 All exponents below 1,000,000 tested at least once. 1997-03-28 All exponents below M33 = M(859433) tested at least once. 1997-01-15 All exponents below M32 = M(756839) tested at least once.