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

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Exponent Range:










MnStatusDetails
382867Factored
FactorDigitsBitsDate
6622700767529821062659542332789.12016-12-22 12:53:16
ECM
DigitsB1Curves
2550000280 / 280
30250000370 / 640
Estimated T-Level: 27.9
TF below 2^88 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski5CDB0
Verified (Factored)Brian J. Beesley3FC58C1CE1C5DCDB0
Verified (Factored)Paul F. Bird3FC58C1CE1C5DCDB0
Verified (Factored)Eivind Triel3FC58C1CE1C5DCDB31938
Verified (Factored)2016-06-01MadPoo3FC58C1CE1C5DCDB287350
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-23Oliver KruseB9E7CDCCAAAC753E1013
Verified2017-11-02kkmrkkblmbrbkB9E7CDCCAAAC753E116907413
Unverified (Reliable)2020-04-18Oliver Kruse4CDB381E668DCC__13183953
P-1 factors
DateFactorB1B2
2016-12-22662270076752982106265954233600000003000000000
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2021-07-06George WoltmanNF-PP1
Start=2/7, B1=30000000, B2=3060000000
2020-04-18Oliver KruseC-PRP
M382867/662270076752982106265954233 : 4CDB381E668DCC__
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-11-02kkmrkkblmbrbkC-PRP
M382867/662270076752982106265954233 : B9E7CDCCAAAC753E
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-09-23Oliver KruseC-PRP
M382867/662270076752982106265954233 : B9E7CDCCAAAC753E
PRP: Unverified (Reliable)
PRP without proof (not generated)
2016-12-22mikrF-PM1
Factor: 662270076752982106265954233 / (P-1, B1=60000000, B2=3000000000, E=12)
2016-06-01MadPooC-LL
3FC58C1CE1C5DCDB
2015-11-23Gordon SpenceNF
no factor from 2^63 to 2^64
2015-11-23Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-13NRNF
no factor from 2^61 to 2^62
2012-07-27alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-11-16lycornNF
no factor from 2^60 to 2^61
2009-01-09Sturle SundeNF
no factor from 2^59 to 2^60
2009-01-05Sturle SundeNF
no factor from 2^58 to 2^59