Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
2893477Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
284807806284158133153939132684.62020-02-11 03:26:38
ECM
DigitsB1Curves
255000070 / 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)Ira Machefsky0DBC1F433405678E0
Verified (Factored)1999-07-26Marcel Prevuznak0DBC1F433405678E2568379
Verified (Factored)2018-09-28kkmrkkblmbrbk0DBC1F433405678E2511183
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-02-12Jinyuan Wang5FC8DA529EEEED441104892653
Verified2020-02-15mnd95FC8DA529EEEED44176038153
P-1 factors
DateFactorB1B2
2020-02-11284807806284158133153939135000000200000000
History
DateUserTypeResult
2020-02-15mnd9C-PRP
M2893477/28480780628415813315393913 : 5FC8DA529EEEED44
PRP: Verified
PRP without proof (not generated)
2020-02-12Jinyuan WangC-PRP
M2893477/28480780628415813315393913 : 5FC8DA529EEEED44
PRP: Verified
PRP without proof (not generated)
2020-02-11masserF-PM1
Factor: 28480780628415813315393913 / (P-1, B1=5000000, B2=200000000, E=12)
2019-10-25masserNF-PM1
B1=2900000, B2=29000000, e=12
2019-01-12chuenkitNF
no factor from 2^67 to 2^68
2018-09-28kkmrkkblmbrbkC-LL
0DBC1F433405678E
2017-11-16Gordon SpenceNF
no factor from 2^66 to 2^67
2017-08-04JossNF-PM1
B1=400000, B2=4000000, E=6
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2016-02-19ramgeisNF
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
2013-01-07dbaughNF
no factor from 2^62 to 2^63
2012-01-13markrNF
no factor from 2^61 to 2^62
2011-01-31Carsten KossendeyNF-PM1
B1=200000, B2=5000000, E=6
2010-12-24JossNF-PM1
B1=20000
2009-07-03Carsten KossendeyNF-PM1
B1=15000, B2=165000
2009-02-13Sturle SundeNF
no factor from 2^60 to 2^61