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:










MnStatusDetails
273281Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
15303737823.9old
ECM
DigitsB1Curves
2550000280 / 280
30250000596 / 640
Estimated T-Level: 29.7
TF below 2^94 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver Kruse280F3704DED125031013
Verified2017-10-13Oliver KruseE1C2758F21B32441125229253
Verified2017-10-13Oliver Kruse280F3704DED1250318273213
Verified2017-11-02kkmrkkblmbrbkE1C2758F21B32441127180553
Verified2019-04-09kkmrkkblmbrbk280F3704DED12503115861413
History
DateUserTypeResult
2024-10-29yuriy_5-1NF-PM1
B1=25141852, B2=6164555276880
2022-03-21Lisander ViaeneNF-PM1
B1=5550000, B2=22789551330
2022-03-20Lisander ViaeneNF-PM1
B1=5550000
2022-01-03Lisander ViaeneNF-PM1
B1=100000
2019-04-09kkmrkkblmbrbkC-PRP
M273281/15303737 : 280F3704DED12503
PRP: Verified
PRP without proof (small exponent)
2017-11-02kkmrkkblmbrbkC-PRP
M273281/15303737 : E1C2758F21B32441
PRP: Verified
PRP without proof (small exponent)
2017-10-13Oliver KruseC-PRP
M273281/15303737 : 280F3704DED12503
PRP: Verified
PRP without proof (small exponent)
2017-10-13Oliver KruseC-PRP
M273281/15303737 : E1C2758F21B32441
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M273281/15303737 : 280F3704DED12503
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M273281/15303737 : 280F3704DED12503
PRP without proof (not generated)