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
1622947Factored
FactorDigitsBitsDate
3929942557740640009169832478.42016-07-30 01:28:05
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.
LL
StatusDateUserResidueShift
Verified (Factored)George Ray52B581CC77FCF5160
Verified (Factored)1998-11-07Fausto Carace52B581CC77FCF5161163317
Verified (Factored)2015-06-27MadPoo52B581CC77FCF516356072
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-02Oliver KruseEB54A2C7A8E501811013
Verified2017-11-01kkmrkkblmbrbkEB54A2C7A8E50181168591113
History
DateUserTypeResult
2017-11-01kkmrkkblmbrbkC-PRP
M1622947/392994255774064000916983 : EB54A2C7A8E50181
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1622947/392994255774064000916983 : EB54A2C7A8E50181
PRP: Verified
PRP without proof (not generated)
2016-07-30Chang Chia-TcheF-ECM
Factor: 392994255774064000916983 / (ECM curve 1, B1=50000, B2=5000000)
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-10-11ramgeisNF
no factor from 2^65 to 2^66
2015-06-27MadPooC-LL
52B581CC77FCF516
2015-04-30monstNF
no factor from 2^64 to 2^65
2015-04-29omylistNF
no factor from 2^63 to 2^64
2011-12-01BigBrotherNF-PM1
B1=1000000, B2=20000000, E=12
2010-08-13GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-05-05Architects CubedNF
no factor from 2^60 to 2^61