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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
2531Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
789673619.6old
193550633927.5old
2872244376544936989460163578744571098427896744144.42009-01-04 21:47:21
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000010085 / 40830
Estimated T-Level: 51.2
TF below 2^165 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseEC331E6E899B72E73013
Verified2017-10-02kkmrkkblmbrbkEC331E6E899B72E73013
Verified2017-12-07ATHEC331E6E899B72E7357413
Verified2020-04-17Oliver Kruse3A6C520D3BC690E4339753
Verified2024-02-03Wentao Huang3A6C520D3BC690E4365153
History
DateUserTypeResult
2024-05-22masserNF-PM1
B1=100000000000, B2=288736597479630300
2024-02-03Wentao HuangC-PRP
M2531/789673/193550633/28722443765449369894601635787445710984278967 : 3A6C520D3BC690E4
PRP: Verified
PRP without proof (small exponent)
2021-07-05ViliamFNF-PM1
B1=1000000000, B2=191000000000
2021-07-04ViliamFNF-PM1
B1=100000000, B2=13100000000
2020-04-17Oliver KruseC-PRP
M2531/789673/193550633/28722443765449369894601635787445710984278967 : 3A6C520D3BC690E4
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M2531/789673/193550633/28722443765449369894601635787445710984278967 : EC331E6E899B72E7
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M2531/789673/193550633/28722443765449369894601635787445710984278967 : EC331E6E899B72E7
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M2531/known_factors : EC331E6E899B72E7
PRP without proof (not generated)
2009-01-04Jayson KingF-ECM
Factor: 28722443765449369894601635787445710984278967