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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
271279Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 268
TF target 244
TF below 2^102 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 142000000
B2 = 3280778370870
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000654 / 1566
Estimated T-Level: 32.1 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski8420
VerifiedUnknown08420
VerifiedBrian J. BeesleyFD624228AA3488420
VerifiedEivind TrielFD624228AA348842150049
Verified2001-11-10Brian J. BeesleyFD624228AA348842120661
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-10-17-Anonymous-factor ECM small0.00 % 2025-10-17
2025-10-12-Anonymous-factor ECM small0.00 % 2025-10-12
2025-10-11-Anonymous-factor ECM small0.00 % 2025-10-11
History
DateUserTypeResult
2025-04-04tim sNF
no factor from 2^67 to 2^68
2024-06-30tim sNF
no factor from 2^66 to 2^67
2023-02-05masserNF-PP1
Start=6/5, B1=20000000, B2=620000000
2023-01-28masserNF-PP1
Start=194/29, B1=20000000, B2=620000000
2023-01-27masserNF-PP1
Start=2/7, B1=20000000, B2=620000000
2022-06-15Sid & AndyNF-PM1
B1=142000000, B2=3280778370870
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2020-01-04Gordon SpenceNF
no factor from 2^65 to 2^66
2018-03-22Gordon SpenceNF
no factor from 2^64 to 2^65
2016-02-01Gordon SpenceNF
no factor from 2^63 to 2^64
2016-02-01Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-13NRNF
no factor from 2^61 to 2^62
2013-07-02lycornNF
no factor from 2^60 to 2^61
2012-09-16alpertronNF-PM1
B1=100000000, B2=2000000000, E=12
2012-02-26JossNF-PM1
B1=2254096
2011-02-18JossNF-PM1
B1=2000000
2009-01-25Sturle SundeNF
no factor from 2^59 to 2^60
2009-01-01Sturle SundeNF
no factor from 2^58 to 2^59