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
2021801Factored
FactorDigitsBitsDate
16174409823.9old
387527983286399934503272375.02021-11-18 20:26:38
ECM
DigitsB1Curves
2550000280 / 280
30250000129 / 640
Estimated T-Level: 26.0 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-06Oliver Kruse8E121445181B56B01013
Verified (Factored)2017-11-14kkmrkkblmbrbk8E121445181B56B0110282813
Verified2021-11-18SRJ287729775E61F1DD138A2184512853
History
DateUserTypeResult
2021-11-19curtiscCERT
PRP Certification
Proof certified good
2021-11-18SRJ2877C-PRP
M2021801/16174409/38752798328639993450327 : 29775E61F1DD138A
PRP proof power = 7
PRP: Verified
Proof certified good
2021-11-18_p95holder_F-ECM
Factor: 38752798328639993450327 / (ECM curve 3, B1=50000, B2=5000000)
2017-11-14kkmrkkblmbrbkC-PRP
M2021801/16174409 : 8E121445181B56B0
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-06Oliver KruseC-PRP
M2021801/16174409 : 8E121445181B56B0
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12