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
3821Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
12020447524091340.1old
5061774562078853799341272478.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000017146 / 40830
Estimated T-Level: 52.1
TF below 2^168 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse19EF04F4C41A94EC2013
Verified2017-10-12kkmrkkblmbrbk19EF04F4C41A94EC2347213
Verified2020-04-17Oliver Kruse01C94EC91311DDCA2286153
Verified2024-02-03Wentao Huang01C94EC91311DDCA2294753
Verified2024-04-02cramsey8701C94EC91311DDCA2351653
P-1 factors
DateFactorB1B2
2024-04-0260844795502242502155636858644456194350000000005000000000
History
DateUserTypeResult
2024-07-03masserNF-PM1
B1=77000000000, B2=107388476724028500
2024-04-03cramsey87NF-PM1
B1=5000000000, B2=620575825127698440
2024-04-02cramsey87C-PRP
M3821/1202044752409/506177456207885379934127 : 01C94EC91311DDCA
PRP: Verified
PRP without proof (small exponent)
2024-04-02cramsey87F-PM1
Factors: 1202044752409,506177456207885379934127 / (P-1, B1=5000000000)
2024-04-02cramsey87NF-PM1
B1=5000000000, B2=51786556739817900
2024-02-03Wentao HuangC-PRP
M3821/1202044752409/506177456207885379934127 : 01C94EC91311DDCA
PRP: Verified
PRP without proof (small exponent)
2021-09-09Jinyuan WangNF-PM1
B1=1300000000, B2=13000000000, E=12
2020-04-17Oliver KruseC-PRP
M3821/1202044752409/506177456207885379934127 : 01C94EC91311DDCA
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M3821/1202044752409/506177456207885379934127 : 19EF04F4C41A94EC
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M3821/1202044752409/506177456207885379934127 : 19EF04F4C41A94EC
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M3821/1202044752409/506177456207885379934127 : 19EF04F4C41A94EC
PRP without proof (not generated)