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

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Exponent Range:










MnStatusDetails
7247Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
642227917155600946812065.8old
16681209368226022063725292580.5old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000002208 / 9201
Estimated T-Level: 41.2
TF below 2^132 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseD8D9970E50A526902013
Verified2017-10-02kkmrkkblmbrbkD8D9970E50A526902013
Verified2017-12-07ATHD8D9970E50A526902241813
Verified2020-04-17Oliver KruseD12F637D03389B6D2380053
Verified2024-02-03Wentao HuangD12F637D03389B6D2471853
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M7247/64222791715560094681/1668120936822602206372529 : D12F637D03389B6D
PRP: Verified
PRP without proof (small exponent)
2023-08-27-Anonymous-NF-PM1
B1=33000000000, B2=136594664543487150
2021-12-16Lisander ViaeneNF-PM1
B1=100000000
2020-04-17Oliver KruseC-PRP
M7247/64222791715560094681/1668120936822602206372529 : D12F637D03389B6D
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M7247/64222791715560094681/1668120936822602206372529 : D8D9970E50A52690
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M7247/64222791715560094681/1668120936822602206372529 : D8D9970E50A52690
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M7247/known_factors : D8D9970E50A52690
PRP without proof (not generated)