### Major GIMPS Milestones

October 1, 2014: All exponents below 31,000,000 double-checked.

May 1, 2014: All exponents below 51,000,000 tested at least once.

February 23, 2014: Double-checking proves M(30402457) is the 43rd Mersenne prime.

January 25, 2013: Prime M(57885161) discovered!!

December 20, 2012: Double-checking proves M(25964951) is the 42nd Mersenne prime.

December 1, 2011: Double-checking proves M(24036583) is the 41st Mersenne prime.

July 11, 2010: Double-checking proves M(20996011) is the 40th Mersenne prime.

April 12, 2009: Prime M(42643801) discovered!!

September 6, 2008: Prime M(37156667) discovered!!

August 23, 2008: Prime M(43112609) discovered!!

September 4, 2006: Prime M(32582657) discovered!

July 10, 2006: Double-checking proves M(13466917) is the 39th Mersenne prime.

December 15, 2005: Prime M(30402457) discovered!

February 18, 2005: Prime M(25964951) discovered!

May 15, 2004: Prime M(24036583) discovered!

November 17, 2003: Prime M(20996011) is discovered!

February 2, 2003: Double-checking proves M(6972593) is the 38th Mersenne prime.

November 14, 2001: Prime M(13466917) is discovered!

May 19, 2000: Double-checking proves M(2976221) and M(3021377) are the 36th and 37th Mersenne primes.

June 1, 1999: Prime M(6972593) is discovered!

December 18, 1998: Double-checking proves M(1398269) is the 35th Mersenne prime.

March 29, 1998: Double-checking proves M(1257787) is the 34th Mersenne prime.

January 27, 1998: Prime M(3021377) is discovered!

August 30, 1997: Double-checking proves M(756839) and M(859433) are the 32nd and 33rd Mersenne primes.

August 24, 1997: Prime M(2976221) is discovered!

November 13, 1996: Prime M(1398269) is discovered!

Third quarter, 1996: Double-checking proves M(216091) is the 31st Mersenne prime.

### Some older and less high-profile GIMPS Milestones

April 8, 2014: All exponents below 50,000,000 tested at least once.

April 6, 2014: All exponents below 49,000,000 tested at least once.

March 26, 2014: All exponents below 48,000,000 tested at least once.

March 17, 2014: All exponents below 47,000,000 tested at least once.

March 13, 2014: All exponents below 46,000,000 tested at least once.

February 14, 2014: All exponents below 30,000,000 double-checked.

February 4, 2014: All exponents below 29,000,000 double-checked.

January 12, 2014: All exponents below 28,000,000 double-checked.

January 9, 2014: All exponents below 27,000,000 double-checked.

December 11, 2013: All exponents below 45,000,000 tested at least once.

November 9, 2012: All exponents below 44,000,000 tested at least once.

September 5, 2012: All exponents below M(43112609) tested at least once.

September 5, 2012: All exponents below M(42643801) tested at least once.

August 27, 2012: All exponents below 25,000,000 double-checked.

April 23, 2011: All exponents below 22,000,000 double-checked.

December 25, 2010: All exponents below M(37156667) tested at least once.

December 25, 2010: All exponents below M(32582657) tested at least once.

July 29, 2010: All exponents below M(30402457) tested at least once.

January 7, 2010: All exponents below 20,000,000 double-checked.

October 30, 2009: All exponents below 19,000,000 double-checked.

April 8, 2009: All exponents below M(25964951) tested at least once.

February 23, 2009: All exponents below 18,000,000 double-checked.

February 23, 2009: All exponents below M(24036583) tested at least once.

July 8, 2008: All exponents below 17,000,000 double-checked.

July 4, 2008: All exponents below M(20996011) tested at least once.

December 31, 2007: All exponents below 20,000,000 tested at least once.

December 3, 2007: All exponents below 16,000,000 double-checked.

April 23, 2007: All exponents below 15,000,000 double-checked.

September 11, 2006: All exponents below 14,000,000 double-checked.

June 13, 2006: All exponents below 13,000,000 double-checked.

March 1, 2006: All exponents below 17,000,000 tested at least once.

December 24, 2005: All exponents below 16,000,000 tested at least once.

April 26, 2005: All exponents below 10,000,000 double-checked.

February 23, 2005: All exponents below 15,000,000 tested at least once.

October 3, 2004: All exponents below M(13466917) tested at least once.

September 17, 2004: All exponents below 9,000,000 double-checked.

March 9, 2004: All exponents below 12,000,000 tested at least once.

February 23, 2004: All exponents below 8,000,000 double-checked.

December 16, 2002: All exponents less than 6,000,000 double-checked.

July 19, 2002: All exponents below 10,000,000 tested at least once.

May 2, 2002: All exponents less than 5,000,000 double-checked.

April 15, 2002: All exponents below 9,000,000 tested at least once.

September 25, 2001: All exponents below 8,000,000 tested at least once.

July 25, 2001: All exponents below M(6972593) tested at least once.

May 20, 2001: All exponents less than 4,000,000 double-checked.

April 6, 2001: First 10 million digit number sucessfully double-checked.

April 1, 2001: All exponents less than 6,000,000 tested at least once.

September 25, 2000: First 10 million digit number tested for primality.

March 15, 2000: All exponents less than 5,000,000 tested at least once.

October 16, 1999: All exponents less than 2,000,000 double-checked.

August 19, 1999: All exponents less than 4,000,000 tested at least once.

December 26, 1998: All Mersenne numbers less than a million digits tested at least once.

September 26, 1998: All exponents below M(3021377) tested at least once.

September 19, 1998: All exponents below M(2976221) tested at least once.

March 5, 1998: All exponents below 2,000,000 tested at least once.

October 30, 1997: All exponents below 1,000,000 double-checked.

October 11, 1997: All exponents below M(1398269) tested at least once.

August 28, 1997: All exponents below M(1257787) tested at least once.

May 26, 1997: All exponents below 1,000,000 tested at least once.

March 28, 1997: All exponents below M(859433) tested at least once.

January 15, 1997: All exponents below M(756839) tested at least once.