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
2028227Factored
FactorDigitsBitsDate
452527809453367440806793192685.22020-02-25 17:30:15
ECM
DigitsB1Curves
2550000280 / 280
30250000113 / 640
Estimated T-Level: 25.9 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Michael Giering76A5D391BAB49B9B0
Verified (Factored)1999-01-10Juuso Lehtinen76A5D391BAB49B9B422323
Verified (Factored)2016-07-15Mark Rose76A5D391BAB49B9B701299
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-02-26Christoph ZengerF0BF97E55C6315411161364553
Verified2020-02-27Jinyuan WangF0BF97E55C631541172036353
Verified2020-02-28Chang Chia-TcheF0BF97E55C631541117321653
History
DateUserTypeResult
2020-02-28Chang Chia-TcheC-PRP
M2028227/45252780945336744080679319 : F0BF97E55C631541
PRP: Verified
PRP without proof (not generated)
2020-02-27Jinyuan WangC-PRP
M2028227/45252780945336744080679319 : F0BF97E55C631541
PRP: Verified
PRP without proof (not generated)
2020-02-26Christoph ZengerC-PRP
M2028227/45252780945336744080679319 : F0BF97E55C631541
PRP: Verified
PRP without proof (not generated)
2020-02-25mnd9F-ECM
Factor: 45252780945336744080679319 / (ECM curve 2, B1=50000, B2=5000000, Sigma=859248965020263)
2019-04-11mikrNF-PM1
B1=4000000, B2=200000000, E=12
2019-03-20chuenkitNF
no factor from 2^67 to 2^68
2016-07-15Mark RoseC-LL
76A5D391BAB49B9B
2016-07-06Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-10-31ramgeisNF
no factor from 2^65 to 2^66
2015-04-13VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-13VictordeHollanderNF
no factor from 2^63 to 2^64
2013-10-19David CampeauNF-PM1
B1=580000, B2=15080000, E=12
2013-02-21dbaughNF
no factor from 2^62 to 2^63
2012-02-07Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-12-14JossNF-PM1
B1=202822
2009-01-03Sturle SundeNF
no factor from 2^60 to 2^61