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

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MnStatusDetails
277687Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
2776871721.4old
4442993722.12008-07-21 09:15:44
198268519927.62008-07-21 09:15:44
575313816325530255832065.62014-09-05 15:16:35
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000225 / 1566
Estimated T-Level: 30.7
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver KruseB01F2AC765EF8A924013
Verified2017-10-12Oliver KruseB01F2AC765EF8A92410228613
Verified2017-11-06kkmrkkblmbrbkB01F2AC765EF8A92460413
Verified2020-04-17Oliver Kruse704E4B5F2BD09D2D414032353
Verified2024-08-07kkmrkkblmbrbk704E4B5F2BD09D2D46691953
History
DateUserTypeResult
2024-11-05yuriy_5-1NF-PM1
B1=25547204, B2=6253273236210
2024-08-07PappyCERT
PRP Certification
Proof certified good
2024-08-07kkmrkkblmbrbkC-PRP
M277687/2776871/4442993/198268519/57531381632553025583 : 704E4B5F2BD09D2D
PRP proof power = 5
PRP: Verified
Proof certified good
2023-03-19Naegi MakotoNF-PM1
B1=2000000, B2=79396947630
2022-01-03Lisander ViaeneNF-PM1
B1=100000
2020-04-17Oliver KruseC-PRP
M277687/2776871/4442993/198268519/57531381632553025583 : 704E4B5F2BD09D2D
PRP: Verified
PRP without proof (small exponent)
2017-11-06kkmrkkblmbrbkC-PRP
M277687/2776871/4442993/198268519/57531381632553025583 : B01F2AC765EF8A92
PRP: Verified
PRP without proof (small exponent)
2017-10-12Oliver KruseC-PRP
M277687/2776871/198268519/4442993/57531381632553025583 : B01F2AC765EF8A92
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M277687/known_factors : B01F2AC765EF8A92
PRP without proof (not generated)
2014-09-05TJAOIF-ECM
Factor: 57531381632553025583
2008-07-21J FeitsmaF
Factor: 4442993
2008-07-21J FeitsmaF
Factor: 198268519