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

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MnStatusDetails
6869Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
257051719927.9old
2921460666357335978391677182403639335114.5old
38509119153368970765281934838627156272906729435148158.12021-03-25 19:13:49
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001308 / 9201
Estimated T-Level: 40.7
TF below 2^130 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-09-21Oliver Kruse38ABF344CD059F582013
Verified (Factored)2017-10-02kkmrkkblmbrbk38ABF344CD059F582013
Verified (Factored)2017-12-07ATH38ABF344CD059F582460913
Verified (Factored)2020-04-17Oliver Kruse1EB23EEB19078D2E240453
Verified2021-03-26mnd91EB23EEB19078D2E3315253
Verified2021-03-29LaurV1EB23EEB19078D2E3342253
History
DateUserTypeResult
2023-08-17-Anonymous-NF-PM1
B1=35000000000, B2=149103333456127050
2021-12-16Lisander ViaeneNF-PM1
B1=100000000
2021-03-29LaurVC-PRP
M6869/257051719/29214606663573359783916771824036393/385091191533689707652819348386271562729067294351 : 1EB23EEB19078D2E
PRP: Verified
PRP without proof (small exponent)
2021-03-26mnd9C-PRP
M6869/257051719/29214606663573359783916771824036393/385091191533689707652819348386271562729067294351 : 1EB23EEB19078D2E
PRP: Verified
PRP without proof (small exponent)
2021-03-25Ryan PropperF-ECM
Factor: 385091191533689707652819348386271562729067294351 / (ECM curve 1, B1=43000000, B2=198654756318, Sigma=15775481255543476242)
2020-04-17Oliver KruseC-PRP
M6869/257051719/29214606663573359783916771824036393 : 1EB23EEB19078D2E
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M6869/257051719/29214606663573359783916771824036393 : 38ABF344CD059F58
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M6869/257051719/29214606663573359783916771824036393 : 38ABF344CD059F58
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M6869/known_factors : 38ABF344CD059F58
PRP without proof (not generated)