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
3581Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
21487514.4old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000002425 / 16550
Estimated T-Level: 45.7
TF below 2^147 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseCDD31D1F4F8EEA801013
Verified2017-10-12kkmrkkblmbrbkCDD31D1F4F8EEA801252513
Verified2020-04-17Oliver KruseAFB655A5E1BC9437125153
Verified2024-02-03Wentao HuangAFB655A5E1BC94371197953
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M3581/21487 : AFB655A5E1BC9437
PRP: Verified
PRP without proof (small exponent)
2022-06-20mikrNF-PM1
B1=120000000000, B2=314605609292724750
2021-09-05Jinyuan WangNF-PM1
B1=1300000000, B2=13000000000, E=12
2020-04-17Oliver KruseC-PRP
M3581/21487 : AFB655A5E1BC9437
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M3581/21487 : CDD31D1F4F8EEA80
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M3581/21487 : CDD31D1F4F8EEA80
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M3581/21487 : CDD31D1F4F8EEA80
PRP without proof (not generated)