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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
1321267Factored
FactorDigitsBitsDate
57712942571032.4old
5288710485489887095372168.82018-06-01 11:34:34
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 Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-09-30Oliver KruseB9A4C2B65192159B1013
Verified (Factored)2017-10-23kkmrkkblmbrbkB9A4C2B65192159B139923513
Verified2018-06-03ANONYMOUSC7B42034105BE1E9270078553
Verified2018-06-07_p95holder_C7B42034105BE1E9213830453
History
DateUserTypeResult
2018-06-07_p95holder_C-PRP
M1321267/5771294257/528871048548988709537 : C7B42034105BE1E9
PRP: Verified
PRP without proof (not generated)
2018-06-03ANONYMOUSC-PRP
M1321267/5771294257/528871048548988709537 : C7B42034105BE1E9
PRP: Verified
PRP without proof (not generated)
2018-06-01TJAOIF-ECM
Factor: 528871048548988709537 / (ECM curve 111, B1=50000, B2=5000000)
2017-10-23kkmrkkblmbrbkC-PRP
M1321267/5771294257 : B9A4C2B65192159B
PRP: Verified
PRP without proof (not generated)
2017-09-30Oliver KruseC-PRP
M1321267/5771294257 : B9A4C2B65192159B
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12