Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
5581Composite, with 5 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
1293593201211236.9old
1899251380021572891857.4old
44730403085601275991962.0old
71537423737604352731400884774275933109.1old
848693682205613275334512975057734145737122.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000006069 / 16550
Estimated T-Level: 46.8
TF below 2^151 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse780CCE155F4491AE5013
Verified2017-10-02kkmrkkblmbrbk780CCE155F4491AE5013
Verified2017-12-07ATH780CCE155F4491AE5541413
Verified2020-04-17Oliver KruseBAEFC8B17E71CC1D5182153
Verified2024-02-03Wentao HuangBAEFC8B17E71CC1D5309253
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M5581/129359320121/189925138002157289/4473040308560127599/715374237376043527314008847742759/8486936822056132753345129750577341457 : BAEFC8B17E71CC1D
PRP: Verified
PRP without proof (small exponent)
2023-07-14-Anonymous-NF-PM1
B1=45000000000, B2=181622797963056450
2021-08-27Seth_TrNF-PM1
B1=400000000
2021-08-27Seth_TrNF-PM1
B1=100000000
2020-04-17Oliver KruseC-PRP
M5581/129359320121/189925138002157289/4473040308560127599/715374237376043527314008847742759/8486936822056132753345129750577341457 : BAEFC8B17E71CC1D
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M5581/129359320121/189925138002157289/4473040308560127599/715374237376043527314008847742759/8486936822056132753345129750577341457 : 780CCE155F4491AE
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M5581/129359320121/189925138002157289/4473040308560127599/715374237376043527314008847742759/8486936822056132753345129750577341457 : 780CCE155F4491AE
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M5581/known_factors : 780CCE155F4491AE
PRP without proof (not generated)