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
1935133Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
98762936792961209771963.12012-11-18 12:40:52
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
BadMichael Bertrand736914FB6900ED8C0
Verified (Factored)1999-02-21Eric Leblanc57952884A6895F471756047
Verified (Factored)1999-08-22Piotr Pindel57952884A6895F47854114
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselBE938C5DDB6E697B013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-05Oliver Kruse931BAEE2264238E71013
Verified2017-11-11Chang Chia-Tche931BAEE2264238E71175429413
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
BE938C5DDB6E697B
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-11Chang Chia-TcheC-PRP
M1935133/9876293679296120977 : 931BAEE2264238E7
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1935133/9876293679296120977 : 931BAEE2264238E7
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2012-11-18Torchwood InstituteF-ECM
Factor: 9876293679296120977
2011-11-20kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-02-02S485122NF
no factor from 2^60 to 2^61