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
4721
Composite: proven not-prime with Lucas-Lehmer test
No factors below 266
TF target 244
P-1
B1 = 5000000000000
B2 = 9223372036854775807
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
6026000000031606 / 105362
Estimated T-Level: 56.5 ⓘ
TF below 2^183 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShiftSoftware
VerifiedUnknown09100Unknown,(aka U)
VerifiedGeorge Woltman1C942BA6878F89100Woltman,Prime95,first web release,(aka W4)
VerifiedBrian J. Beesley1C942BA6878F89100Mac,John Sweeney,v1.4,(aka J3)
Verified2015-04-11MadPoo 🙂1C942BA6878F89102354Windows 64-bit,Prime95,v26,(aka We4)
History
DateUserTypeResult
2025-10-01Kamil GorskiNF-PM1B1=5000000000000, B2=9.2352272306643E+18
2025-09-22Kamil GorskiNF-PM1B1=5000000000000
2025-03-23One ManNF-PM1B1=923546012497, B2=77108267444388180
2023-08-15masserNF-PP1Start=6/5, B1=1910000000, B2=341890000000
2023-07-10masserNF-PP1Start=98/41, B1=1910000000, B2=76400000000
2023-05-28-anonymous-NF-PM1B1=67000000000, B2=672059035159211700
2022-06-21Anton RepkoNFno factor TF: 64-66
2021-05-13ATHNF-PP1Start=2/7, B1=1000000000, B2=241000000000
2021-02-04Ruslan BorisovNFno factor TF: 64-65
2018-08-25snme2pm1NFno factor TF: 63-64
2016-12-02snme2pm1NFno factor TF: 62-63
2016-11-25-anonymous-NF-PM1B1=100000000000, B2=1000000000000, E=12
2016-04-17mikrNF-PM1B1=30000000000, B2=2400000000000, E=12
2016-02-23LaurVNFno factor TF: 57-58
2015-06-21Sid & AndyNFno factor TF: 61-62
2015-04-11MadPoo 🙂C-LL1C942BA6878F8910
2015-02-12JayderNF-PM1B1=2560040779, B2=163842609831, E=12
2012-09-29bcp19NFno factor TF: 60-61
2011-04-29JossNF-PM1B1=10000000000
2011-01-25monstNFno factor TF: 58-60
2003-01-09-anonymous-NFno factor TF: 1-57
2003-01-09-anonymous-NF-PM1B1=4290000000
2002-09-22-anonymous-NF-PM1B1=3221225472, B2=4290000000, E=48
2002-08-10-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
2000-08-17-anonymous-NFno factor TF: 1-56
2000-02-16-anonymous-NFno factor TF: 54-55
1999-12-30-anonymous-NFno factor TF: 53-54
1999-09-30-anonymous-NFno factor TF: 52-53