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
1955957Factored
FactorDigitsBitsDate
3296381943802448337370690321401895366338124.62023-01-19 20:04:50
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)Al LovrichB2E896C600FC182B0
Verified (Factored)1999-03-15Steve GardnerB2E896C600FC182B1267849
Verified (Factored)2015-07-03MadPooB2E896C600FC182B1260924
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-01-21RichD0F6F13377D4503FE91134828553
P-1 factors
DateFactorB1B2
2023-01-193296381943802448337370690321401895366340000000204923747490
History
DateUserTypeResult
2023-01-21ZhiYuanCERT
PRP Certification
Proof certified good
2023-01-21RichD0C-PRP
M1955957/32963819438024483373706903214018953663 : F6F13377D4503FE9
PRP proof power = 7
PRP: Verified
Proof certified good
2023-01-19RichD0F-PM1
Factor: 32963819438024483373706903214018953663 / (P-1, B1=40000000, B2=204923747490)
2023-01-11JossNF-PM1
B1=1955957, B2=1464372000
2022-12-19JossNF-PM1
B1=1955957, B2=854421750
2022-08-15masserNF-PP1
Start=2/7, B1=1500000, B2=52500000
2019-05-13chuenkitNF
no factor from 2^67 to 2^68
2018-11-26JossNF-PM1
B1=1955957, B2=244494625, E=12
2018-05-11JossNF-PM1
B1=1955957, B2=195595700, E=12
2018-03-03JossNF-PM1
B1=1955957, B2=120000000, E=12
2018-02-12JossNF-PM1
B1=1955957, B2=60000000, E=12
2018-01-22TJAOINF
no factor from 2^66 to 2^67
2018-01-19JossNF-PM1
B1=1955957, B2=30000000, E=12
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-09-07ramgeisNF
no factor from 2^65 to 2^66
2015-07-03MadPooC-LL
B2E896C600FC182B
2015-04-21lycornNF
no factor from 2^64 to 2^65
2015-04-21lycornNF
no factor from 2^63 to 2^64
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-05-10kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2010-01-14S485122NF
no factor from 2^60 to 2^61