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

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MnStatusDetails
4398839Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
8684555392558372538951458136869732106.12022-12-26 07:46:14
ECM
DigitsB1Curves
255000012 / 280
Estimated T-Level: 20.2 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Tom AlbanoCA5DC83B8801D2B70
Verified (Factored)1999-12-01Samuel H. Baughman IICA5DC83B8801D2B73966657
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2023-01-01Perig7F111DBD27034C1C1217253
P-1 factors
DateFactorB1B2
2022-12-2686845553925583725389514581368697620000029438922240
History
DateUserTypeResult
2023-01-01Choi4KANGCERT
PRP Certification
Proof certified good
2023-01-01PerigC-PRP
M4398839/86845553925583725389514581368697 : 7F111DBD27034C1C
PRP proof power = 7
PRP: Verified
Proof certified good
2022-12-26DRobinsonPEF-PM1
Factor: 86845553925583725389514581368697 / (P-1, B1=6200000, B2=29438922240)
2021-02-11-Anonymous-NF
no factor from 2^72 to 2^73
2021-01-28-Anonymous-NF
no factor from 2^71 to 2^72
2021-01-28-Anonymous-NF
no factor from 2^70 to 2^71
2021-01-24-Anonymous-NF
no factor from 2^69 to 2^70
2021-01-24-Anonymous-NF
no factor from 2^68 to 2^69
2019-01-09Ismo LaitelaNF-PM1
B1=2237739, B2=62656681, E=12
2018-10-30chuenkitNF
no factor from 2^67 to 2^68
2018-05-07chuenkitNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-06-20snme2pm1NF
no factor from 2^65 to 2^66
2014-07-15lycornNF
no factor from 2^64 to 2^65
2014-07-15JayderNF
no factor from 2^63 to 2^64
2012-02-29GrunwalderGIMPNF
no factor from 2^1 to 2^63
2012-01-14Squeeky_SquirrelNF-PM1
B1=110000, B2=2255000, E=6
2010-11-04markrNF
no factor from 2^61 to 2^62
2009-08-08Carsten KossendeyNF-PM1
B1=25000, B2=356250