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
4261
Composite: proven not-prime with Lucas-Lehmer test
No factors below 266
TF target 244
P-1
B1 = 2000000000000
B2 = 9223372036854775807
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
65800000000194238 / 194238
70240000000072986 / 350860
Estimated T-Level: 66.0 ⓘ
TF below 2^214 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
VerifiedUnknown5B9A0Unknown,(aka U)
VerifiedGeorge WoltmanC9BE94F718B35B9A0Woltman,Prime95,first web release,(aka W4)
VerifiedBrian J. BeesleyC9BE94F718B35B9A0Mac,John Sweeney,v1.4,(aka J3)
Verified2015-04-11MadPoo 🙂C9BE94F718B35B9A76Windows 64-bit,Prime95,v26,(aka We4)
History
DateUserTypeResult
2025-03-18Kamil GorskiNF-PM1B1=2000000000000, B2=1.8326045144074E+19
2023-08-14masserNF-PP1Start=6/5, B1=2150000000, B2=384850000000
2023-07-10masserNF-PP1Start=84/13, B1=2150000000, B2=86000000000
2023-05-19-anonymous-NF-PM1B1=76000000000, B2=761666906426476050
2022-06-12Anton RepkoNFno factor TF: 64-66
2021-05-12ATHNF-PP1Start=2/7, B1=1000000000, B2=241000000000
2021-02-07Ruslan BorisovNFno factor TF: 64-65
2019-11-12ZabeNF-PM1B1=100000000003, B2=4000000000039
2018-06-26snme2pm1NFno factor TF: 63-64
2016-12-15snme2pm1NFno factor TF: 62-63
2016-05-17-anonymous-NF-PM1B1=100000000000, B2=1000000000000, E=12
2016-02-23LaurVNFno factor TF: 57-58
2015-06-19Sid & AndyNFno factor TF: 61-62
2015-05-11mikrNF-PM1B1=30000000000, B2=2400000000000, E=12
2015-04-11MadPoo 🙂C-LLC9BE94F718B35B9A
2015-02-07JayderNF-PM1B1=3092987047, B2=201044158061, E=12
2012-09-29bcp19NFno factor TF: 60-61
2011-04-26JossNF-PM1B1=10000000000
2011-02-08monstNFno factor TF: 58-60
2006-07-25-anonymous-NF-PM1B1=100000000, B2=4290000000, E=12
2003-01-16-anonymous-NFno factor TF: 1-57
2003-01-09-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
2001-07-17-anonymous-NF-PM1B1=3000000000, B2=4290000000
2001-06-17-anonymous-NF-PM1B1=43000000, B2=4290000000
2001-02-11-anonymous-NF-PM1B1=1000000, B2=100000000
2000-08-31-anonymous-NFno factor TF: 1-56
2000-02-09-anonymous-NFno factor TF: 54-55
1999-12-30-anonymous-NFno factor TF: 53-54
1999-09-22-anonymous-NFno factor TF: 52-53