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
12281
Composite: proven not-prime with Lucas-Lehmer test
No factors below 266
TF target 244
P-1
B1 = 1000000000000
B2 = 1400160173312901000
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000015939 / 40830
Estimated T-Level: 52.0 ⓘ
TF below 2^168 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
VerifiedUnknown09690Unknown,(aka U)
VerifiedGeorge WoltmanF39F1808E5C189690Woltman,Prime95,first web release,(aka W4)
VerifiedBrian J. BeesleyF39F1808E5C189690Mac,John Sweeney,v1.4,(aka J3)
Verified2015-04-11MadPoo 🙂F39F1808E5C189699089Windows 64-bit,Prime95,v26,(aka We4)
History
DateUserTypeResult
2023-08-24masserNF-PP1Start=6/5, B1=650000000, B2=116350000000
2023-08-11snme2pm1NFno factor TF: 63-64
2023-07-09masserNF-PP1Start=110/11, B1=650000000, B2=26000000000
2022-10-29-anonymous-NF-PM1B1=1000000000000, B2=1400160173312901000
2022-03-14-anonymous-NF-PM1B1=100000000000, B2=121047848166084840
2021-10-19Ruslan BorisovNFno factor TF: 65-66
2021-05-09ATHNF-PP1Start=2/7, B1=1000000000, B2=241000000000
2019-03-27Anton RepkoNFno factor TF: 64-65
2018-11-06snme2pm1NFno factor TF: 63-64
2018-07-03James HintzNF-PM1B1=25971532008, B2=1947864900600, E=12
2016-10-19Sid & AndyNFno factor TF: 62-63
2016-02-23LaurVNFno factor TF: 57-58
2015-09-03Sid & AndyNFno factor TF: 61-62
2015-04-11MadPoo 🙂C-LLF39F1808E5C18969
2013-01-29bcp19NF-PM1B1=10000000000, B2=100000000000, E=12
2012-11-22bcp19NFno factor TF: 60-61
2011-05-06-anonymous-NF-PM1B1=1000000000
2010-07-20George WoltmanNFno factor TF: 59-60
2010-07-20George WoltmanNFno factor TF: 58-59
2003-09-29-anonymous-NF-PM1B1=8388608, B2=838860800, E=12
2003-09-29-anonymous-NF-PM1B1=16777216, B2=1677721600, E=12
2003-07-06-anonymous-NF-PM1B1=4194304, B2=419430400, E=12
2003-05-19-anonymous-NF-PM1B1=2097152, B2=209715200, E=12
2003-04-27-anonymous-NF-PM1B1=1048576, B2=104857600, E=48
2003-04-03-anonymous-NF-PM1B1=524288, B2=52428800, E=48
2003-03-27-anonymous-NF-PM1B1=262144, B2=26214400, E=30
2003-02-02-anonymous-NF-PM1B1=131072, B2=13107200, E=30
2002-08-10-anonymous-NFno factor TF: 1-57
2002-07-14-anonymous-NF-PM1B1=65536, B2=6553600, E=12
2002-06-09-anonymous-NF-PM1B1=32768, B2=3276800
2002-04-28-anonymous-NF-PM1B1=16384, B2=1638400
2001-09-22-anonymous-NF-PM1B1=43000000, B2=4290000000
2001-07-17Alex KruppaNF-PM1B1=1000000, B2=100000000
2001-04-29-anonymous-NF-PM1B1=100000, B2=10000000
2000-08-31-anonymous-NFno factor TF: 1-56
2000-07-17-anonymous-NFno factor TF: 1-55
2000-01-19-anonymous-NFno factor TF: 53-54
1999-09-14-anonymous-NFno factor TF: 52-53