Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
3847
Composite: proven not-prime with Lucas-Lehmer test
No factors below 266
TF target 244
P-1
B1 = 500000000000
B2 = 5048767708220756520
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
65800000000194238 / 194238
702400000000140455 / 350860
Estimated T-Level: 67.0
TF below 2^218 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
VerifiedUnknown19000Unknown,(aka U)
VerifiedGeorge Woltman6A67AEF965E599000Woltman,Prime95,first web release,(aka W4)
VerifiedBrian J. Beesley6A67AEF965E599000Mac,John Sweeney,v1.4,(aka J3)
Verified2015-04-11MadPoo 🙂6A67AEF965E59900865Windows 64-bit,Prime95,v26,(aka We4)
History
DateUserTypeResult
2025-11-09One ManNF-PM1B1=1037676958870, B2=1494455555264571900
2025-06-20-anonymous-NF-PM1B1=4000000000000, B2=1.2016700776796E+19
2024-06-17Ethan O'ConnorNF-PM1B1=500000000000, B2=5048767708220756520
2023-08-13masserNF-PP1Start=6/5, B1=2410000000, B2=431390000000
2023-07-11masserNF-PP1Start=99/61, B1=2410000000, B2=96400000000
2023-07-08masserNF-PM1B1=72000000000, B2=104876664258065700
2022-03-17Anton RepkoNFno factor TF: 65-66
2021-05-13ATHNF-PP1Start=2/7, B1=1000000000, B2=241000000000
2020-12-13Anton RepkoNFno factor TF: 64-65
2018-06-01snme2pm1NFno factor TF: 63-64
2016-11-29snme2pm1NFno factor TF: 62-63
2016-05-14-anonymous-NF-PM1B1=200000000000, B2=2000000000000, E=12
2016-05-12-anonymous-NF-PM1B1=100000000000, B2=1000000000000, E=12
2016-02-23LaurVNFno factor TF: 57-58
2015-07-30snme2pm1NFno factor TF: 61-62
2015-04-11MadPoo 🙂C-LL6A67AEF965E59900
2015-04-01mikrNF-PM1B1=30000000000, B2=2400000000000, E=12
2015-02-04JayderNF-PM1B1=3131005715, B2=200384365740, E=12
2012-09-29bcp19NFno factor TF: 60-61
2011-04-23JossNF-PM1B1=10000000000
2011-02-06monstNFno factor TF: 58-60
2003-01-25-anonymous-NFno factor TF: 1-57
2002-12-31-anonymous-NF-PM1B1=4290000000
2002-09-22-anonymous-NF-PM1B1=3221225472, B2=4290000000, E=48
2002-08-03-anonymous-NF-PM1B1=2147483648, B2=4290000000, E=48
2002-06-02-anonymous-NF-PM1B1=1073741824, B2=4290000000, E=48
2001-06-17-anonymous-NF-PM1B1=3000000000, B2=4290000000
2001-06-09-anonymous-NF-PM1B1=43000000, B2=4290000000
2001-02-11-anonymous-NF-PM1B1=1000000, B2=100000000
2000-08-17-anonymous-NFno factor TF: 1-56
2000-02-01-anonymous-NFno factor TF: 54-55
1999-12-23-anonymous-NFno factor TF: 53-54
1999-09-22-anonymous-NFno factor TF: 52-53