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

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MnStatusDetails
871349Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
186419873029031444.1old
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-28Oliver Kruse2D8A646A922FA3131013
Verified2017-10-14Oliver Kruse2D8A646A922FA313113138213
Verified2017-12-19ATH2D8A646A922FA313136281313
Verified2020-04-22Oliver Kruse0D42DB23B9687792126714653
Verified2025-05-07kkmrkkblmbrbk0D42DB23B9687792137328153
History
DateUserTypeResult
2025-05-07DooMMasteRCERT
PRP Certification
Proof certified good
2025-05-07kkmrkkblmbrbkC-PRP
M871349/18641987302903 : 0D42DB23B9687792
PRP proof power = 6
PRP: Verified
Proof certified good
2020-04-22Oliver KruseC-PRP
M871349/18641987302903 : 0D42DB23B9687792
PRP: Verified
PRP without proof (small exponent)
2017-12-19ATHC-PRP
M871349/18641987302903 : 2D8A646A922FA313
PRP: Verified
PRP without proof (small exponent)
2017-10-14Oliver KruseC-PRP
M871349/18641987302903 : 2D8A646A922FA313
PRP: Verified
PRP without proof (small exponent)
2017-09-28Oliver KruseC-PRP
M871349/18641987302903 : 2D8A646A922FA313
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=300000, B2=10000000, E=12