Marin Mersenne 2^P-1
Username
Password
Forgot password?
Blue
Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
1943911Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
380126518366943620267929444331331101.62023-03-25 13:43:56
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Mischa KennE3B826049CEE0AFB0
Verified (Factored)1999-01-10Mike LarkinE3B826049CEE0AFB1426174
Verified (Factored)2015-06-27MadPooE3B826049CEE0AFB1382033
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel0F4D79DC8960CFE2013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-03-26RichD00F4D79DC8960CFE21170423553
P-1 factors
DateFactorB1B2
2023-03-2538012651836694362026792944433135000000050000000
History
DateUserTypeResult
2025-09-03COMPUTRON9001CERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
0F4D79DC8960CFE2
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2023-03-26George WoltmanCERT
PRP Certification
Proof certified good
2023-03-26RichD0C-PRP
M1943911/3801265183669436202679294443313 : 0F4D79DC8960CFE2
PRP proof power = 7
PRP: Verified
Proof certified good
2023-03-25RichD0F-PM1
Factor: 3801265183669436202679294443313 / (P-1, B1=50000000)
2022-08-16masserNF-PP1
Start=2/7, B1=1500000, B2=54000000
2022-08-06Wentao HuangNF-PM1
B1=2340000, B2=10302160050
2019-05-11chuenkitNF
no factor from 2^67 to 2^68
2018-09-17JossNF-PM1
B1=1943911, B2=194391100, E=12
2018-02-28JossNF-PM1
B1=1943911, B2=113248640, E=12
2018-02-11JossNF-PM1
B1=1943911, B2=56624320, E=12
2018-02-04JossNF-PM1
B1=1943911, B2=28312160, E=12
2017-10-27TJAOINF
no factor from 2^66 to 2^67
2017-04-12JossNF-PM1
B1=1415608, B2=14156080, E=12
2017-01-04JossNF-PM1
B1=983062
2016-12-24JossNF-PM1
B1=819219
2016-12-16JossNF-PM1
B1=682683
2016-12-15JossNF-PM1
B1=568903
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-08Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-09-06ramgeisNF
no factor from 2^65 to 2^66
2015-06-27MadPooC-LL
E3B826049CEE0AFB
2015-05-04lycornNF
no factor from 2^64 to 2^65
2015-05-04lycornNF
no factor from 2^63 to 2^64
2011-12-12markrNF-PM1
B1=275000, B2=6000000, E=12
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-01-25S485122NF
no factor from 2^60 to 2^61