Largest known probable prime Mersenne Cofactors (proper divisor of 2p-1 with p prime)
|
Cofactor |
Digits |
When |
Found by |
|---|---|---|---|
|
(2684127-1)/23765203727 |
205933 |
04/2009 |
Jens Kruse Andersen |
|
(2406583-1)/813167 |
122388 |
02/2009 |
Jens Kruse Andersen |
|
(2271549-1)/238749682487 |
81734 |
02/2009 |
Jens Kruse Andersen |
|
(2271211-1)/613961495159 |
81631 |
02/2009 |
Jens Kruse Andersen |
|
(2221509-1)/292391881 |
66673 |
02/2009 |
Jens Kruse Andersen |
|
(2173867-1)/52536637502689 |
52326 |
06/2005 |
Donovan Johnson |
|
(2136883-1)/536581361 |
41198 |
05/2005 |
Donovan Johnson |
|
(2130439-1)/260879 |
39261 |
05/2005 |
Donovan Johnson |
|
(2106391-1)/286105171290931103 |
32010 |
05/2005 |
Donovan Johnson |
|
(286371-1)/41681512921035887 |
25984 |
05/2005 |
Donovan Johnson |
|
(263703-1)/42808417 |
19169 |
05/2005 |
Donovan Johnson |
|
(258199-1)/237604901713907577052391 |
17497 |
05/2005 |
Donovan Johnson |
The smaller factor of each Mersenne number was obtained from Will Edgington's Mersenne Page. All probable prime cofactors on this page are listed on Henri Lifchitz's Top 10000 PRPs page. Click here to view.
20 largest known prime Mersenne cofactors (The Prime Pages)
Biography of Marin Mersenne
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Last updated on May 12, 2009
Donovan Johnson