| rank | prime |
digits | who | when | comment |
| 1 | (220887-1)/(694257144641 · 3156563122511 · 28533972487913 · 1893804442513836092687) |
6229 |
c4 |
Sep 2009 |
Mersenne cofactor, ECPP |
| 2 | (217683-1)/(234000819833373807217 · 62265855698776681155719328257) |
5274 |
c4 |
Sep 2009 |
Mersenne cofactor, ECPP |
| 3 | (217029-1)/418879343 |
5118 |
c8 |
Sep 2006 |
Mersenne cofactor, ECPP |
| 4 | (214561-1)/8074991336582835391 |
4365 |
c8 |
Oct 2004 |
Mersenne cofactor, ECPP |
| 5 | (214621-1)/(1958650799081 · 9787919624201558678734079) |
4365 |
c4 |
Nov 2008 |
Mersenne cofactor, ECPP |
| 6 | (212451-1)/(4980401 · 15289230353 · 1143390212315192593598809) |
3708 |
c4 |
Oct 2008 |
Mersenne cofactor, ECPP |
| 7 | (211813-1)/(70879 · 207971134271377) |
3537 |
c8 |
Aug 2002 |
Mersenne cofactor, ECPP |
| 8 | (210169-1)/10402314702094700470118039921523041260063 |
3022 |
c8 |
Jul 2002 |
Mersenne cofactor, ECPP |
| 9 | (210007-1)/(14477908246561 · 136255313 · 10368448917257) |
2979 |
c8 |
Jun 2002 |
Mersenne cofactor, ECPP |
| 10 | (29697-1)/(724126946527 · 19092282046942032847) |
2888 |
c8 |
Jun 2002 |
Mersenne cofactor, ECPP |
| 11 | (29733-1)/(2932747561 · 353435802999708808999 · 4424579967215442704801447) |
2876 |
c4 |
Aug 2001 |
Mersenne cofactor, ECPP |
| 12 | (29901-1)/(87770464009 · 4512717821471308759 · 8336998551279784091551 · 1017688752041649660766793 · 25146117302614435382787771401 · 1502440689076527620360606617623599) |
2844 |
c2 |
Dec 2001 |
Mersenne cofactor, ECPP |
| 13 | (28849-1)/(52368383 · 15264764469472455023) |
2637 |
c4 |
Aug 2001 |
Mersenne cofactor, ECPP |
| 14 | (27757-1)/233293220467553594643512097574361 |
2303 |
c2 |
Mar 2001 |
Mersenne cofactor, ECPP |
| 15 | (27673-1)/2563193011919 |
2298 |
M1 |
Dec 1997 |
Mersenne cofactor, cyclotomy |
| 16 | (27331-1)/458072843161 |
2196 |
EM |
Oct 1997 |
Mersenne cofactor, ECPP |
| 17 | (27417-1)/(1930694161304071 · 3888241452787718190543521) |
2193 |
c8 |
Sep 2002 |
Mersenne cofactor, ECPP |
| 18 | (27039-1)/(1324401538053479 · 8541573097 · 218216841131937276721) |
2074 |
c2 |
Jan 2001 |
Mersenne cofactor, ECPP |
| 19 | (26883-1)/(1885943 · 2043031664890199) |
2051 |
M1 |
Dec 1997 |
Mersenne cofactor, cyclotomy |
| 20 | (26199-1)/(46113927071 · 3895469424045161025776010136475884556282201) |
1813 |
c8 |
Feb 2005 |
Mersenne cofactor, ECPP |