Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
3999497Factored
FactorDigitsBitsDate
8535881077126194744732169.52018-06-15 17:46:45
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)1998-02-08Scott Galiardo84A14B5084F4A6820
Verified (Factored)1999-10-15Kevin Chiu84A14B5084F4A6823833269
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2018-06-15ATH485B9CB8BE3E102C1318202353
Verified2018-06-16kkmrkkblmbrbk485B9CB8BE3E102C1157284153
History
DateUserTypeResult
2022-07-20JossNF-PM1
B1=4000000, B2=4016348700
2022-02-12JossNF-PM1
B1=4000000, B2=116886000
2022-01-20JossNF-PM1
B1=3999497, B2=5215136850
2020-02-02JossNF-PM1
B1=3999497, B2=500000000, E=12
2018-06-16kkmrkkblmbrbkC-PRP
M3999497/853588107712619474473 : 485B9CB8BE3E102C
PRP: Verified
PRP without proof (not generated)
2018-06-15ATHC-PRP
M3999497/853588107712619474473 : 485B9CB8BE3E102C
PRP: Verified
PRP without proof (not generated)
2018-06-15YxinityF
Factor: 853588107712619474473 / TF: 69-70
2018-06-15YxinityNF
no factor from 2^68 to 2^69
2018-06-11TJAOINF
no factor from 2^67 to 2^68
2016-12-18Gordon SpenceNF
no factor from 2^66 to 2^67
2016-09-30JossNF-PM1
B1=3999497, B2=399949700, E=12
2016-09-29JossNF-PM1
B1=3999497, B2=39994970, E=12
2016-09-26JossNF-PM1
B1=3999497
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-01-27ramgeisNF
no factor from 2^65 to 2^66
2015-08-15Squeeky_SquirrelNF-PM1
B1=190000, B2=4845000, E=6
2014-11-25JossNF-PM1
B1=86048
2013-10-08David CampeauNF
no factor from 2^64 to 2^65
2013-07-18JayderNF
no factor from 2^63 to 2^64
2012-02-29GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-09-19Squeeky_SquirrelNF-PM1
B1=70000, B2=1190000, E=6
2010-11-04Sid & AndyNF
no factor from 2^61 to 2^62
2009-07-27Carsten KossendeyNF-PM1
B1=20000, B2=290000