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:










MnStatusDetails
3121Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
1123561720.1old
31509617824.9old
68053280171032.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000014925 / 40830
Estimated T-Level: 51.8
TF below 2^167 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse5FD032FEA628BD013013
Verified2017-10-12kkmrkkblmbrbk5FD032FEA628BD01338513
Verified2020-04-17Oliver Kruse04106228E9B702623298053
Verified2024-02-03Wentao Huang04106228E9B702623111753
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M3121/1123561/31509617/6805328017 : 04106228E9B70262
PRP: Verified
PRP without proof (small exponent)
2022-03-11mikrNF-PM1
B1=60000000000, B2=314806422904433460
2021-07-08ViliamFNF-PM1
B1=1000000000, B2=191000000000
2020-04-17Oliver KruseC-PRP
M3121/1123561/31509617/6805328017 : 04106228E9B70262
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M3121/1123561/31509617/6805328017 : 5FD032FEA628BD01
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M3121/1123561/31509617/6805328017 : 5FD032FEA628BD01
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M3121/1123561/31509617/6805328017 : 5FD032FEA628BD01
PRP without proof (not generated)