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
1891907Factored
FactorDigitsBitsDate
15589313691030.5old
4805635681310835191858.72015-09-28 11:49:52
1823818095107482688232167.32020-11-30 04:47:56
488381071579283335716732375.42021-11-19 10:19:04
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 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)2017-09-30alpertron67ADBBACBFDA7BB32013
Verified (Factored)2017-10-20Oliver Kruse67ADBBACBFDA7BB328869313
Verified (Factored)2020-12-01PoaoE9A9483F919B0A5231908253
Verified2021-11-19JackBlockE9A9483F919B0A524139960553
History
DateUserTypeResult
2022-04-12Lisander ViaeneNF-PM1
B1=500000, B2=2903586840
2021-11-19Ben DeloCERT
PRP Certification
Proof certified good
2021-11-19JackBlockC-PRP
M1891907/1558931369/480563568131083519/182381809510748268823/48838107157928333571673 : E9A9483F919B0A52
PRP proof power = 7
PRP: Verified
Proof certified good
2021-11-19TJAOIF-ECM
Factor: 48838107157928333571673 / (ECM curve 172, B1=50000, B2=6600000)
2020-12-01curtiscCERT
PRP Certification
Proof certified good
2020-12-01PoaoC-PRP
M1891907/1558931369/480563568131083519/182381809510748268823 : E9A9483F919B0A52
PRP proof power = 7
PRP: Verified (Factored)
Proof certified good
2020-11-30Chang Chia-TcheF-ECM
Factor: 182381809510748268823 / (ECM curve 7, B1=50000, B2=5000000, Sigma=1730276509208936)
2017-10-20Oliver KruseC-PRP
M1891907/1558931369/480563568131083519 : 67ADBBACBFDA7BB3
PRP: Verified (Factored)
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M1891907/1558931369/480563568131083519 : 67ADBBACBFDA7BB3
PRP: Verified (Factored)
PRP without proof (not generated)
2015-09-28TJAOIF
Factor: 480563568131083519 / TF: 58-59