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Small Mersenne Prime Factors
Prime numbers of the form Mp= 2p − 1 are called Mersenne primes. For Mp to be prime, p must also be prime.
Any factor q of a Mersenne number 2p − 1 must be of the form 2kp + 1, where integer k ≥ 0. Furthermore, q must be 1 or 7 mod 8.
Exp. Prime Factor Digits Year
198499139699837 ~1980
198505139701037 ~1980
1985057476413698 ~1983
1985239476457378 ~1983
1985293119117598 ~1981
1985293436764478
1985453476508738 ~1983
1985509476522178 ~1983
19855512223817139 ~1984
19855911588472819 ~1984
1985771635446738 ~1983
1985791357442398 ~1983
1985897158871778 ~1982
198593939718797 ~1980
1986001119160078 ~1981
1986067317770738 ~1982
1986133317781298 ~1982
1986359993179518 ~1984
1986421437012638 ~1983
1986437158914978 ~1982
1986577119194638 ~1981
1986839993419518 ~1984
198692339738477 ~1980
1986949476867778 ~1983
1987049596114718 ~1983
Exp. Prime Factor Digits Year
19870491589639219
1987151516659278 ~1983
1987201119232078 ~1981
1987241158979298 ~1982
1987277119236638 ~1981
1987339357721038 ~1983
1987411357733998 ~1983
19874811907981779 ~1984
198761939752397 ~1980
1987679159014338 ~1982
1987889159031138 ~1982
1988023834969678 ~1983
1988087159046978 ~1982
198818339763677 ~1980
198821939764397 ~1980
1988219159057538
1988251795300418 ~1983
1988263198826318 ~1982
1988291159063298 ~1982
198847139769437 ~1980
1988513119310798 ~1981
198853139770637 ~1980
1988561159084898 ~1982
198857939771597 ~1980
1988587318173938 ~1982
Exp. Prime Factor Digits Year
1988599357947838 ~1983
1988653119319198 ~1981
1988729755717038 ~1983
1988837278437198 ~1982
1988891994445518 ~1984
19888971074004399 ~1984
1988941914912878 ~1984
198896339779277 ~1980
198899939779997 ~1980
1989073437596078 ~1983
198913139782637 ~1980
19891611113930179 ~1984
1989479159158338 ~1982
1989551835611438 ~1983
198956339791277 ~1980
1989583477499938 ~1983
1989721318355378 ~1982
1989847198984718 ~1982
19900072746209679 ~1985
1990111835846638 ~1983
199015139803037 ~1980
1990171358230798 ~1983
1990447199044718 ~1982
1990463517520398 ~1983
199055939811197 ~1980
Exp. Prime Factor Digits Year
19905592070181379
1990621437936638 ~1983
199082339816477 ~1980
199088339817677 ~1980
1990939358369038 ~1983
199112339822477 ~1980
1991251358425198 ~1983
1991489159319138 ~1982
199151939830397 ~1980
1991609477986178 ~1983
1991879358538238 ~1983
1991881119512878 ~1981
1991911199191118 ~1982
19919291394350319 ~1984
199196339839277 ~1980
199199939839997 ~1980
1992073119524398 ~1981
1992181318748978 ~1982
199229939845997 ~1980
1992299159383938
1992583199258318 ~1982
1992631199263118 ~1982
1992719159417538 ~1982
1992803836977278 ~1983
1992971837047838 ~1983
395
GIMPS The Prime Pages FactorDb.com
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26-05-10