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

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MnStatusDetails
2056139Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
250848959927.9old
826567879929.62008-07-15 07:49:49
23051017765459001253592271.02021-10-21 07:35:41
ECM
DigitsB1Curves
2550000280 / 280
30250000153 / 640
Estimated T-Level: 26.2
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-06Oliver KruseB6E6ADFF5D36C4E62013
Verified (Factored)2017-11-15Chang Chia-TcheB6E6ADFF5D36C4E6214732913
Verified2021-10-22SRJ28774B8F3026701A99F433196153
History
DateUserTypeResult
2021-10-24lugge_waCERT
PRP Certification
Proof certified good
2021-10-22SRJ2877C-PRP
M2056139/250848959/826567879/2305101776545900125359 : 4B8F3026701A99F4
PRP proof power = 7
PRP: Verified
Proof certified good
2021-10-21RadosHordosCZF-ECM
Factor: 2305101776545900125359 / (ECM curve 1, B1=50000, B2=5000000, Sigma=6769910816528278)
2017-11-15Chang Chia-TcheC-PRP
M2056139/250848959/826567879 : B6E6ADFF5D36C4E6
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-06Oliver KruseC-PRP
M2056139/250848959/826567879 : B6E6ADFF5D36C4E6
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 826567879