Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
1355843Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
97620697826.5old
50363086520471342.22008-07-15 09:58:38
1718286327072231547.32008-08-26 19:53:26
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-01Kriesel20687A466697912C013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30Oliver KruseC99373321CA632553013
Verified2017-10-23kkmrkkblmbrbkC99373321CA632553132993713
History
DateUserTypeResult
2025-09-03tjaehnsiCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
20687A466697912C
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-10-23kkmrkkblmbrbkC-PRP
M1355843/97620697/5036308652047/171828632707223 : C99373321CA63255
PRP: Verified
PRP without proof (not generated)
2017-09-30Oliver KruseC-PRP
M1355843/97620697/5036308652047/171828632707223 : C99373321CA63255
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-08-26-Anonymous-F
Factor: 171828632707223
2008-07-15J FeitsmaF
Factor: 5036308652047