Marin Mersenne 2^P-1
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Finding World Record Primes Since 1996

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MnStatusDetails
18731Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
37463515.2old
25264372811031.22008-08-26 19:58:53
1261581175991236.92008-08-26 19:58:53
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000003127 / 4588
Estimated T-Level: 38.4
TF below 2^123 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse57929A7B35DEE0653013
Verified2017-10-12kkmrkkblmbrbk57929A7B35DEE0653877113
Verified2020-04-17Oliver Kruse426DBA8E3B8C44653825353
Verified (Factored)2022-05-12Jorge Coveiro426DBA8E3B8C446511015953
Verified2024-07-01kkmrkkblmbrbk426DBA8E3B8C446531555853
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-10-02masserfactor ECM small0.00 % 2025-10-03
History
DateUserTypeResult
2025-01-01masserNF-PP1
Start=6/5, B1=132000000, B2=131868000000
2024-12-19masserNF-PP1
Start=159/37, B1=132000000, B2=131868000000
2024-12-13masserNF-PP1
Start=2/7, B1=132000000, B2=131868000000
2024-07-01kkmrkkblmbrbkC-PRP
M18731/126158117599/2526437281/37463 : 426DBA8E3B8C4465
PRP: Verified
PRP without proof (small exponent)
2023-04-18JacobZNF-PM1
B1=5600000000, B2=16709983434234090
2022-05-12Jorge CoveiroC-PRP
M18731/37463 : 426DBA8E3B8C4465
PRP: Verified
PRP without proof (small exponent)
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-17Oliver KruseC-PRP
M18731/37463/2526437281/126158117599 : 426DBA8E3B8C4465
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M18731/37463/2526437281/126158117599 : 57929A7B35DEE065
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M18731/37463/2526437281/126158117599 : 57929A7B35DEE065
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M18731/37463/2526437281/126158117599 : 57929A7B35DEE065
PRP without proof (not generated)
2008-08-26-Anonymous-F
Factor: 126158117599
2008-08-26-Anonymous-F
Factor: 2526437281