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
11981
Composite, with 5 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
4097503722.0old
13011367823.62008-08-26 19:58:35
319478324081901184872064.82008-08-29 02:24:28
12911688253437008468646663832890.12008-11-22 12:25:27
302108831228930467458764813442186023337121.22022-06-22 14:59:17
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001723 / 9201
Estimated T-Level: 40.9 ⓘ
TF below 2^131 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 Kruse24BE36751DD82D5A4013
Factored
No proof (small exponent)
2017-10-02kkmrkkblmbrbk24BE36751DD82D5A4013
Factored
No proof (small exponent)
2017-12-07ATH24BE36751DD82D5A4918213
Factored
No proof (small exponent)
2020-04-17Oliver Kruse63B0E7B384F997CE41020053
Verified
No proof (small exponent)
2022-06-22aperson163B0E7B384F997CE5538453
History
DateUserTypeResult
2025-03-09masserNF-PP1Start=193/13, B1=430000000, B2=429570000000
2025-02-28masserNF-PP1Start=6/5, B1=430000000, B2=429570000000
2025-01-21masserNF-PP1Start=2/7, B1=430000000, B2=429570000000
2023-04-06-anonymous-NF-PM1B1=100000000000, B2=122192573512709700
2022-06-22aperson1C-PRPM11981/4097503/13011367/31947832408190118487/1291168825343700846864666383/3021088312289304674587648134421860233 : 63B0E7B384F997CE
2022-06-22James HintzF-ECMFactor: 3021088312289304674587648134421860233 / ECM curve 1334, B1=3000000, B2=300000000, Montgomery Sigma=950656630356138
2020-04-17Oliver KruseC-PRPM11981/4097503/13011367/31947832408190118487/1291168825343700846864666383 : 63B0E7B384F997CE
2017-12-07ATHC-PRPM11981/4097503/13011367/31947832408190118487/1291168825343700846864666383 : 24BE36751DD82D5A
2017-10-02kkmrkkblmbrbkC-PRPM11981/4097503/13011367/31947832408190118487/1291168825343700846864666383 : 24BE36751DD82D5A
2017-09-21Oliver KruseC-PRPM11981/4097503/13011367/31947832408190118487/1291168825343700846864666383 : 24BE36751DD82D5A
2017-09-21Oliver KruseC-PRPM11981/4097503/13011367/31947832408190118487/1291168825343700846864666383 : 24BE36751DD82D5A
2016-09-07kkmrkkblmbrbkNF-PM1B1=100000000, B2=10000000000, E=12
2008-11-22-anonymous-F-ECMFactor: 1291168825343700846864666383
2008-08-29-anonymous-F-ECMFactor: 31947832408190118487
2008-08-26-anonymous-FFactor: 13011367