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

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Exponent Range:










MnStatusDetails
2001511Factored
FactorDigitsBitsDate
1988566171134438941542850750528235495883341133.92013-11-11 19:27:22
ECM
DigitsB1Curves
2550000280 / 280
30250000129 / 640
Estimated T-Level: 26.0
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Bruce Bailey0BD6D2C55A43967F0
Verified (Factored)1999-05-02Leon Helmink0BD6D2C55A43967F1181451
Verified (Factored)2012-06-18Gaurav Khanna0BD6D2C55A43967F0
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse2D0FED88C61EF3551013
Verified2017-11-13kkmrkkblmbrbk2D0FED88C61EF3551195561213
P-1 factors
DateFactorB1B2
2013-11-11198856617113443894154285075052823549588331000000005000000000
History
DateUserTypeResult
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-11-13kkmrkkblmbrbkC-PRP
M2001511/19885661711344389415428507505282354958833 : 2D0FED88C61EF355
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M2001511/19885661711344389415428507505282354958833 : 2D0FED88C61EF355
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12
2013-11-11BloodIceF-PM1
Factor: 19885661711344389415428507505282354958833
2013-07-16BloodIceNF
no factor from 2^67 to 2^68
2013-07-16BloodIceNF
no factor from 2^66 to 2^67
2013-06-11BloodIceNF-PM1
B1=10000000, B2=200000000, E=12
2013-02-28BloodIceNF
no factor from 2^65 to 2^66
2013-02-28BloodIceNF
no factor from 2^64 to 2^65
2013-02-28BloodIceNF
no factor from 2^63 to 2^64
2013-02-17BloodIceNF-PM1
B1=6000000, B2=60000000, E=12
2013-02-03dbaughNF
no factor from 2^62 to 2^63
2012-06-18Gaurav KhannaC-LL
0BD6D2C55A43967F
2011-12-23Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-11-21JossNF-PM1
B1=200151
2009-01-02Sturle SundeNF
no factor from 2^60 to 2^61