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
11971
Composite, with 4 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Assignments
AssignedUserWork TypeStage% DoneUpdatedEst CompleteExpired
2026-03-30-anonymous-ECM2026-03-302026-03-31
Factored
FactorDigitsBitsDate
11611871823.5old
23175857824.52008-08-26 19:58:35
456479129691135.42008-08-26 19:58:35
12825091295196745211960.22008-08-29 02:24:28
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001753 / 9201
Estimated T-Level: 41.0
TF below 2^131 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors
ShiftTypeBase
Verified
No proof (small exponent)
2017-09-21Oliver KruseA774586921285C604013
Verified
No proof (small exponent)
2017-10-02kkmrkkblmbrbkA774586921285C604013
Verified
No proof (small exponent)
2017-12-07ATHA774586921285C6041187513
Verified
No proof (small exponent)
2020-04-17Oliver Kruse30F8E5D0EA7C2A7A4114553
Verified
No proof (small exponent)
2024-07-01kkmrkkblmbrbk30F8E5D0EA7C2A7A41143553
History
DateUserTypeResult
2025-03-09masserNF-PP1Start=151/67, B1=430000000, B2=429570000000
2025-02-24masserNF-PP1Start=6/5, B1=430000000, B2=429570000000
2025-01-21masserNF-PP1Start=2/7, B1=430000000, B2=429570000000
2024-07-01kkmrkkblmbrbkC-PRP
M11971/11611871/1282509129519674521/23175857/45647912969 : 30F8E5D0EA7C2A7A
2023-04-06-anonymous-NF-PM1B1=100000000000, B2=122192573512709700
2020-04-17Oliver KruseC-PRP
M11971/11611871/23175857/45647912969/1282509129519674521 : 30F8E5D0EA7C2A7A
2017-12-07ATHC-PRP
M11971/11611871/23175857/45647912969/1282509129519674521 : A774586921285C60
2017-10-02kkmrkkblmbrbkC-PRPM11971/11611871/23175857/45647912969/1282509129519674521 : A774586921285C60
2017-09-21Oliver KruseC-PRPM11971/11611871/23175857/45647912969/1282509129519674521 : A774586921285C60
2016-09-07kkmrkkblmbrbkNF-PM1B1=100000000, B2=10000000000, E=12
2011-02-05Oscar ÖstlinFFactor: 269115061798447
2011-02-05Oscar ÖstlinFFactor: 12284540919622565275359143
2008-08-29-anonymous-F-ECMFactor: 1282509129519674521
2008-08-26-anonymous-FFactor: 45647912969
2008-08-26-anonymous-FFactor: 23175857