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

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MnStatusDetails
195271Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
1502856386471237.1old
144264324576731443.72008-07-27 10:50:05
163919463771431443.92008-07-27 10:50:05
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000168 / 1566
Estimated T-Level: 30.5
TF below 2^96 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver KruseDF1FBF0E5975A5163013
Verified2017-10-12kkmrkkblmbrbkDF1FBF0E5975A516315242113
Verified2020-04-17Oliver KruseA5C3803B16CDEF7B37704053
Verified2023-08-24USAFSSA5C3803B16CDEF7B36542453
History
DateUserTypeResult
2023-08-24Jim DonovanCERT
PRP Certification
Proof certified good
2023-08-24USAFSSC-PRP
M195271/150285638647/14426432457673/16391946377143 : A5C3803B16CDEF7B
PRP proof power = 5
PRP: Verified
Proof certified good
2020-04-17Oliver KruseC-PRP
M195271/150285638647/14426432457673/16391946377143 : A5C3803B16CDEF7B
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M195271/150285638647/14426432457673/16391946377143 : DF1FBF0E5975A516
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M195271/150285638647/14426432457673/16391946377143 : DF1FBF0E5975A516
PRP without proof (not generated)
2017-06-09kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12
2008-07-27J FeitsmaF
Factor: 16391946377143
2008-07-27J FeitsmaF
Factor: 14426432457673