All Cunningham numbers (exponents less than 1200) have been tested for 50 bit factors. Consult this forum for exponents that may need even more ECM factoring. For maximum throughput, you should use GMP-ECM for stage 2.

Factors found by Prime95

M629 has a factor: 45470534643405479586527115047619453123209
M631 has a factor: 474640860193534882628078580680807822523991^**
M673 has a factor: 41283139633378645724930694480520226273492263
M677 has a factor: 53625112691923843508117942311516428173021903300344567^**
M695 has a factor: 225797717267637708506527464987314161
M695 has a factor: 901584692755427378722839770656354167189649601351^**
M731 has a factor: 223192283824457474300157944531480362369858813007^**,***
M733 has a factor: 13948432601001273785699253868326270649^**
M737 has a factor: 1963672214729590922916323781834466879^**
M773 has a factor: 3102804258869848876949115800490112967822146918598407^**,***
M805 has a factor: 368807221314046570921624935038049174011736160751^**
M845 has a factor: 53928095661079461754990292241379839311^**
M871 has a factor: 137403482726882442386895575645854007713
M877 has a factor: 4478527345975241075738524755872079528958635991
M947 has a factor: 11892980076500863942962129100776937
M953 has a factor: 824501439026637805612489876810823
M957 has a factor: 1609806083534335902079374125310994612192903
M967 has a factor: 73214830052905408299354903681341531907328727^**
M971 has a factor: 23917104973173909566916321016011885041962486321502513^*,**
M989 has a factor: 1844138946953172296553312102102187271^**
M997 has a factor: 167560816514084819488737767976263150405095191554732902607^*,**
M1001 has a factor: 20200567342579527631370455849751729349809657695513^**
M1017 has a factor: 72386347544037768298632733630815274606848381343^**
M1033 has a factor: 88910338973359434076776038119074340716281
M1081 has a factor: 1248432852603561685630837661279
M1087 has a factor: 421733524843190780249388261839156579767
M1087 has a factor: 23864222009193938317456687011256092421563991
M1091 has a factor: 97535130364653673535422113471207017
M1097 has a factor: 205295973898620029528272537868263^**
M1099 has a factor: 28617130498420804403756708531447^**
M1113 has a factor: 2363026390394916673046830675466863^**
M1131 has a factor: 1973833390189373292099390923614168779294442399^**
M1133 has a factor: 2468805350190760992979935216750635087
M1141 has a factor: 106014123028829664722111227465753^**
M1145 has a factor: 199439000998738772588908077106387241
M1149 has a factor: 12917254515820483569633735619111
M1157 has a factor: 7616038569790289017964814010721823388947821809
M1181 has a factor: 199668911054466914791190422986407
M1189 has a factor: 600619547820455607135590639621491727
^* indicates first known factor.
^** indicates factorization of the number is now complete.
^*** indicates Paul Zimmermann's gmp-ecm used in stage 2.

Last updated: April 23, 2007