December 21, 2014 | All exponents below 33,000,000 double-checked. |

November 19, 2014 | All exponents below 53,000,000 tested at least once. |

November 19, 2014 | All exponents below 52,000,000 tested at least once. |

November 8, 2014 | All exponents below 32,000,000 double-checked. |

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

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

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. |