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

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Exponent Range:










MnStatusDetails
11890891Factored
FactorDigitsBitsDate
640439268561880685562012375.82018-02-24 12:57:20
ECM
DigitsB1Curves
25500002 / 280
Estimated T-Level: 20.0 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2001-03-25Robert Mahoney901EEAA3FED48FF98375894
Verified (Factored)2005-03-06Daniel Swanson901EEAA3FED48FF9633838
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-11-28RichD01C730A3251E629F11601872553
History
DateUserTypeResult
2021-11-28Brent GoebelCERT
PRP Certification
Proof certified good
2021-11-28RichD0C-PRP
M11890891/64043926856188068556201 : 1C730A3251E629F1
PRP proof power = 8
PRP: Verified
Proof certified good
2018-02-24ConductorF-ECM
Factor: 64043926856188068556201 / (ECM curve 1, B1=50000, B2=5000000)
2018-01-14ramgeisNF
no factor from 2^68 to 2^69
2018-01-14ramgeisNF
no factor from 2^67 to 2^68
2016-02-15VictordeHollanderNF
no factor from 2^66 to 2^67
2015-07-29Sid & AndyNF-PM1
B1=130000, B2=2210000, E=6
2013-11-02NesowaNF
no factor from 2^65 to 2^66
2013-10-21lycornNF
no factor from 2^64 to 2^65