Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
5981
Composite, with 3 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
38833795671031.9old
58131938497192342798872272.3old
92089797111390446352168346388694423142226237975348159.32021-04-05 01:43:42
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000004301 / 16550
Estimated T-Level: 46.3 ⓘ
TF below 2^149 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
No proof (small exponent)
2017-09-21Oliver Kruse68331E23CCB7E7242013
Factored
No proof (small exponent)
2017-10-12kkmrkkblmbrbk68331E23CCB7E7242460413
Factored
No proof (small exponent)
2020-04-17Oliver KruseDAA5707345B1F1B22402553
Verified
No proof (small exponent)
2021-04-05mikrDAA5707345B1F1B23508253
Verified
No proof (small exponent)
2021-04-06Joe S.DAA5707345B1F1B2367453
History
DateUserTypeResult
2025-05-25masserNF-PP1Start=123/19, B1=1500000000, B2=1498500000000
2023-07-25-anonymous-NF-PM1B1=41000000000, B2=167115816667049250
2021-07-07ViliamFNF-PM1B1=1000000000, B2=201000000000
2021-04-06Joe S.C-PRPM5981/3883379567/5813193849719234279887/920897971113904463521683463886944231422262379753 : DAA5707345B1F1B2
2021-04-05mikrC-PRPM5981/3883379567/5813193849719234279887/920897971113904463521683463886944231422262379753 : DAA5707345B1F1B2
2021-04-05Ryan PropperF-ECMFactor: 920897971113904463521683463886944231422262379753
2020-04-17Oliver KruseC-PRPM5981/3883379567/5813193849719234279887 : DAA5707345B1F1B2
2017-10-12kkmrkkblmbrbkC-PRPM5981/3883379567/5813193849719234279887 : 68331E23CCB7E724
2017-09-21Oliver KruseC-PRPM5981/3883379567/5813193849719234279887 : 68331E23CCB7E724
2017-09-21Oliver KruseC-PRPM5981/3883379567/5813193849719234279887 : 68331E23CCB7E724