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
2787497Factored
FactorDigitsBitsDate
250527485327361219045495372684.42021-03-01 06:02:12
ECM
DigitsB1Curves
255000075 / 280
Estimated T-Level: 21.3
TF below 2^66 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Malcolm GrayF75B039BC177D0B00
Verified (Factored)1999-07-04Keith O'DellF75B039BC177D0B01042401
Verified (Factored)2018-08-27kkmrkkblmbrbkF75B039BC177D0B01131322
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2021-03-02Kriesel3D40E89F971471AD197948653
History
DateUserTypeResult
2021-03-02GregCERT
PRP Certification
Proof certified good
2021-03-02KrieselC-PRP
M2787497/25052748532736121904549537 : 3D40E89F971471AD
PRP proof power = 7
PRP: Verified
Proof certified good
2021-03-01mnd9F-ECM
Factor: 25052748532736121904549537 / (ECM curve 1, B1=50000, B2=5000000, Sigma=7057377447355792)
2019-11-11BigBrotherNF-PM1
B1=3000000, B2=90000000, E=12
2019-02-26chuenkitNF
no factor from 2^67 to 2^68
2018-08-27kkmrkkblmbrbkC-LL
F75B039BC177D0B0
2017-10-19Gordon SpenceNF
no factor from 2^66 to 2^67
2017-07-20JossNF-PM1
B1=400000, B2=4000000, E=6
2016-05-04JossNF-PM1
B1=200000, B2=3600000, E=6
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2016-02-08ramgeisNF
no factor from 2^65 to 2^66
2015-04-21VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-21VictordeHollanderNF
no factor from 2^63 to 2^64
2014-11-01JossNF-PM1
B1=123026
2013-01-10dbaughNF
no factor from 2^62 to 2^63
2012-03-07markrNF
no factor from 2^61 to 2^62
2010-11-24markrNF-PM1
B1=100000, B2=2075000, E=6
2010-11-11JossNF-PM1
B1=15000
2009-01-30Sturle SundeNF
no factor from 2^60 to 2^61