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

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
5228147Factored
FactorDigitsBitsDate
542175434487123759417048988957628939937122.02021-09-11 14:37:21
ECM
DigitsB1Curves
25500009 / 280
Estimated T-Level: 20.2 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Allan Schrum4CB98FB16AA67FB60
Bad2000-08-31Michael SchianskyC9E765CF161158B44290797
Verified (Factored)2001-06-03M. Knerndel4CB98FB16AA67FB61512395
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-09-16M0CZYDD2A5C19B4D888BC1393990353
P-1 factors
DateFactorB1B2
2021-09-1154217543448712375941704898895762893998000000400000000
History
DateUserTypeResult
2021-09-16DerekCERT
PRP Certification
Proof certified good
2021-09-16M0CZYC-PRP
M5228147/5421754344871237594170489889576289399 : DD2A5C19B4D888BC
PRP proof power = 7
PRP: Verified
Proof certified good
2021-09-11axnF-PM1
Factor: 5421754344871237594170489889576289399 / (P-1, B1=8000000, B2=400000000)
2021-08-22SRBaseNF
no factor from 2^70 to 2^71
2021-08-18SRBaseNF
no factor from 2^69 to 2^70
2020-11-02TJAOINF
no factor from 2^68 to 2^69
2019-01-22USAFSSNF-PM1
B1=315000, B2=9213750, E=12
2018-06-17ramgeisNF
no factor from 2^67 to 2^68
2016-06-01Gordon SpenceNF
no factor from 2^66 to 2^67
2015-01-31NumberwangNF
no factor from 2^65 to 2^66
2014-12-22VictordeHollanderNF
no factor from 2^64 to 2^65
2014-12-22VictordeHollanderNF
no factor from 2^63 to 2^64
2010-06-15Squeeky_SquirrelNF-PM1
B1=60000, B2=975000, E=6
2009-06-14GrunwalderGIMPNF
no factor from 2^62 to 2^63