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
2861
Composite, with 3 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Assignments
AssignedUserWork TypeStage% DoneUpdatedEst CompleteExpired
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
2025-10-15PhyxickECM2025-10-151970-01-01
Factored
FactorDigitsBitsDate
77156592411032.8old
20516899207067830433211716909014049884823325745147.22018-05-11 08:55:30
263954278549173281607924621494610368134188653930349160.92020-01-16 21:50:33
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000004203 / 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 Kruse52A379C913FD2F0E1013
Factored
No proof (small exponent)
2017-10-12kkmrkkblmbrbk52A379C913FD2F0E1124713
Factored
No proof (small exponent)
2018-05-15marcomichA4F131B5663D152A2103253
Factored
No proof (small exponent)
2018-05-16BattlemaxxA4F131B5663D152A288953
Verified
No proof (small exponent)
2020-01-16nordiA4F131B5663D152A393253
Verified
No proof (small exponent)
2020-01-17mrhA4F131B5663D152A376553
Verified
No proof (small exponent)
2020-04-17Oliver KruseA4F131B5663D152A3253653
History
DateUserTypeResult
2025-04-14masserNF-PP1Start=183/67, B1=4300000000, B2=4295700000000
2024-06-19masserNF-PM1B1=100000000000, B2=47115780524712900
2021-07-07ViliamFNF-PM1B1=1000000000, B2=191000000000
2020-04-17Oliver KruseC-PRPM2861/7715659241/205168992070678304332117169090140498848233257/2639542785491732816079246214946103681341886539303 : A4F131B5663D152A
2020-01-17mrhC-PRPM2861/7715659241/205168992070678304332117169090140498848233257/2639542785491732816079246214946103681341886539303 : A4F131B5663D152A
2020-01-16nordiC-PRPM2861/7715659241/205168992070678304332117169090140498848233257/2639542785491732816079246214946103681341886539303 : A4F131B5663D152A
2020-01-16Ryan PropperF-ECMFactor: 2639542785491732816079246214946103681341886539303
2018-05-16BattlemaxxC-PRPM2861/7715659241/205168992070678304332117169090140498848233257 : A4F131B5663D152A
2018-05-15marcomichC-PRPM2861/7715659241/205168992070678304332117169090140498848233257 : A4F131B5663D152A
2018-05-11James HintzF-ECMFactor: 205168992070678304332117169090140498848233257
2017-10-12kkmrkkblmbrbkC-PRPM2861/7715659241 : 52A379C913FD2F0E
2017-09-21Oliver KruseC-PRPM2861/7715659241 : 52A379C913FD2F0E
2017-09-21Oliver KruseC-PRPM2861/7715659241 : 52A379C913FD2F0E