Date  Miscellaneous milestones 
20150203  All exponents up to 33,219,253 (10 million digits) doublechecked. 
20141108  Doublechecking proves M(32582657) is officially the 44th Mersenne prime. 
20140809  First 100 million digit number successfully, and independently, doublechecked  M(345,678,877). 
20140223  Doublechecking proves M(30402457) is officially the 43rd Mersenne prime. 
20130308  First 100 million digit number successfully doublechecked  M(383,838,383). 
20121220  Doublechecking proves M(25964951) is officially the 42nd Mersenne prime. 
20120627  First 100 million digit number tested for primality without errors  M(332,194,529). 
20111201  Doublechecking proves M(24036583) is officially the 41st Mersenne prime. 
20100711  Doublechecking proves M(20996011) is officially the 40th Mersenne prime. 
20060710  Doublechecking proves M(13466917) is officially the 39th Mersenne prime. 
20030202  Doublechecking proves M(6972593) is officially the 38th Mersenne prime. 
20010406  First 10 million digit number sucessfully doublechecked. 
20000925  First 10 million digit number tested for primality. 
20000519  Doublechecking proves M(2976221) and M(3021377) are officially the 36th and 37th Mersenne primes. 
19981226  All Mersenne numbers less than a million digits tested at least once. 
19981218  Doublechecking proves M(1398269) is officially the 35th Mersenne prime. 
19980329  Doublechecking proves M(1257787) is officially the 34th Mersenne prime. 
19970830  Doublechecking proves M(756839) and M(859433) are officially the 32nd and 33rd Mersenne primes. 
1996Third Quarter  Doublechecking proves M(216091) is officially the 31st Mersenne prime. 

Date  Mersenne Prime milestones 
20151004  All exponents below M(57885161) tested at least once. 
20120905  All exponents below M(43112609) tested at least once. 
20120905  All exponents below M(42643801) tested at least once. 
20101225  All exponents below M(37156667) tested at least once. 
20101225  All exponents below M(32582657) tested at least once. 
20100729  All exponents below M(30402457) tested at least once. 
20090408  All exponents below M(25964951) tested at least once. 
20090223  All exponents below M(24036583) tested at least once. 
20080704  All exponents below M(20996011) tested at least once. 
20041003  All exponents below M(13466917) tested at least once. 
20010725  All exponents below M(6972593) tested at least once. 
19980926  All exponents below M(3021377) tested at least once. 
19980919  All exponents below M(2976221) tested at least once. 
19971011  All exponents below M(1398269) tested at least once. 
19970828  All exponents below M(1257787) tested at least once. 
19970328  All exponents below M(859433) tested at least once. 
19970115  All exponents below M(756839) tested at least once. 

Date  First time checks 
20151226  All exponents below 60,000,000 tested at least once. 
20151222  All exponents below 59,000,000 tested at least once. 
20151004  All exponents below 58,000,000 tested at least once. 
20150809  All exponents below 57,000,000 tested at least once. 
20150809  All exponents below 56,000,000 tested at least once. 
20150606  All exponents below 55,000,000 tested at least once. 
20150105  All exponents below 54,000,000 tested at least once. 
20141119  All exponents below 53,000,000 tested at least once. 
20141119  All exponents below 52,000,000 tested at least once. 
20140501  All exponents below 51,000,000 tested at least once. 
20140408  All exponents below 50,000,000 tested at least once. 
20140406  All exponents below 49,000,000 tested at least once. 
20140326  All exponents below 48,000,000 tested at least once. 
20140317  All exponents below 47,000,000 tested at least once. 
20140313  All exponents below 46,000,000 tested at least once. 
20131211  All exponents below 45,000,000 tested at least once. 
20121109  All exponents below 44,000,000 tested at least once. 
20120905  All exponents below 43,000,000 tested at least once. 
20120905  All exponents below 42,000,000 tested at least once. 
20120805  All exponents below 41,000,000 tested at least once. 
20120802  All exponents below 40,000,000 tested at least once. 
20120722  All exponents below 39,000,000 tested at least once. 
20110719  All exponents below 38,000,000 tested at least once. 
20101225  All exponents below 37,000,000 tested at least once. 
20101225  All exponents below 36,000,000 tested at least once. 
20101225  All exponents below 35,000,000 tested at least once. 
20101225  All exponents below 34,000,000 tested at least once. 
20101225  All exponents below 33,000,000 tested at least once. 
20101225  All exponents below 32,000,000 tested at least once. 
20100806  All exponents below 31,000,000 tested at least once. 
20100729  All exponents below 30,000,000 tested at least once. 
20100714  All exponents below 29,000,000 tested at least once. 
20100210  All exponents below 28,000,000 tested at least once. 
20090818  All exponents below 27,000,000 tested at least once. 
20090408  All exponents below 26,000,000 tested at least once. 
20090225  All exponents below 25,000,000 tested at least once. 
20090223  All exponents below 24,000,000 tested at least once. 
20081222*  All exponents below 23,000,000 tested at least once. 
20081025*  All exponents below 22,000,000 tested at least once. 
20080819*  All exponents below 21,000,000 tested at least once. 
20071231  All exponents below 20,000,000 tested at least once. 
20071117*  All exponents below 19,000,000 tested at least once. 
20061024  All exponents below 18,000,000 tested at least once. 
20060301  All exponents below 17,000,000 tested at least once. 
20051224  All exponents below 16,000,000 tested at least once. 
20050223  All exponents below 15,000,000 tested at least once. 
20050212*  All exponents below 14,000,000 tested at least once. 
20041003*  All exponents below 13,000,000 tested at least once. 
20040309  All exponents below 12,000,000 tested at least once. 
20040118*  All exponents below 11,000,000 tested at least once. 
20020719  All exponents below 10,000,000 tested at least once. 
20020415  All exponents below 9,000,000 tested at least once. 
20010925  All exponents below 8,000,000 tested at least once. 
20010925*  All exponents below 7,000,000 tested at least once. 
20010401  All exponents below 6,000,000 tested at least once. 
20000315  All exponents below 5,000,000 tested at least once. 
19990819  All exponents below 4,000,000 tested at least once. 
19980926*  All exponents below 3,000,000 tested at least once. 
19980305  All exponents below 2,000,000 tested at least once. 
19970526  All exponents below 1,000,000 tested at least once. 
* = estimated  

Date  Double checks 
20160129  All exponents below 35,000,000 doublechecked. 
20150519  All exponents below 34,000,000 doublechecked. 
20141221  All exponents below 33,000,000 doublechecked. 
20141108  All exponents below 32,000,000 doublechecked. 
20141001  All exponents below 31,000,000 doublechecked. 
20140214  All exponents below 30,000,000 doublechecked. 
20140204  All exponents below 29,000,000 doublechecked. 
20140111  All exponents below 28,000,000 doublechecked. 
20140109  All exponents below 27,000,000 doublechecked. 
20121220  All exponents below 26,000,000 doublechecked. 
20120827  All exponents below 25,000,000 doublechecked. 
20111201  All exponents below 24,000,000 doublechecked. 
20111201  All exponents below 23,000,000 doublechecked. 
20110423  All exponents below 22,000,000 doublechecked. 
20100711  All exponents below 21,000,000 doublechecked. 
20100107  All exponents below 20,000,000 doublechecked. 
20091030  All exponents below 19,000,000 doublechecked. 
20090223  All exponents below 18,000,000 doublechecked. 
20080708  All exponents below 17,000,000 doublechecked. 
20071203  All exponents below 16,000,000 doublechecked. 
20070423  All exponents below 15,000,000 doublechecked. 
20060911  All exponents below 14,000,000 doublechecked. 
20060613  All exponents below 13,000,000 doublechecked. 
20060613  All exponents below 12,000,000 doublechecked. 
20051212*  All exponents below 11,000,000 doublechecked. 
20050426  All exponents below 10,000,000 doublechecked. 
20040917  All exponents below 9,000,000 doublechecked. 
20040223  All exponents below 8,000,000 doublechecked. 
20030227*  All exponents below 7,000,000 doublechecked. 
20021216  All exponents below 6,000,000 doublechecked. 
20020502  All exponents below 5,000,000 doublechecked. 
20010520  All exponents below 4,000,000 doublechecked. 
20000519*  All exponents below 3,000,000 doublechecked. 
19991016  All exponents below 2,000,000 doublechecked. 
19971030  All exponents below 1,000,000 doublechecked. 
* = estimated  