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
3221
Composite, with 2 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
644201619.3old
20241049288639788924588885095472212960372942137.22018-11-18 06:05:06
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000015215 / 40830
Estimated T-Level: 51.9 ⓘ
TF below 2^167 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 KruseC9F868CE6B1A27791013
Factored
No proof (small exponent)
2017-10-12kkmrkkblmbrbkC9F868CE6B1A27791191113
Verified
No proof (small exponent)
2018-11-18rucio0A59E638A21FD5D12185053
Verified
No proof (small exponent)
2018-11-18kkmrkkblmbrbk0A59E638A21FD5D1220853
Verified
No proof (small exponent)
2020-04-17Oliver Kruse0A59E638A21FD5D1244853
Verified
No proof (small exponent)
2025-10-06Dobri0A59E638A21FD5D12115053
History
DateUserTypeResult
2025-10-06DobriC-PRPM3221/644201/202410492886397889245888850954722129603729 : 0A59E638A21FD5D1
2025-04-24masserNF-PP1Start=75/31, B1=3100000000, B2=3096900000000
2022-04-16mikrNF-PM1B1=70000000000, B2=367004699921960100
2021-07-09ViliamFNF-PM1B1=1000000000, B2=191000000000
2020-04-17Oliver KruseC-PRPM3221/644201/202410492886397889245888850954722129603729 : 0A59E638A21FD5D1
2018-12-15-anonymous-NF-PM1B1=1000000, B2=1000000000, E=12
2018-11-18kkmrkkblmbrbkC-PRPM3221/644201/202410492886397889245888850954722129603729 : 0A59E638A21FD5D1
2018-11-18rucioC-PRPM3221/644201/202410492886397889245888850954722129603729 : 0A59E638A21FD5D1
2018-11-18eteoF-ECMFactor: 202410492886397889245888850954722129603729
2017-10-12kkmrkkblmbrbkC-PRPM3221/644201 : C9F868CE6B1A2779
2017-09-21Oliver KruseC-PRPM3221/644201 : C9F868CE6B1A2779
2017-09-21Oliver KruseC-PRPM3221/644201 : C9F868CE6B1A2779