Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
1866547Factored
FactorDigitsBitsDate
77764487800602524396332272.72018-02-26 16:25:01
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
Verified (Factored)John Borleis III9F050E291E227F360
Verified (Factored)1998-12-13Jean-Michel Merliot9F050E291E227F36201912
Verified (Factored)2015-06-28MadPoo9F050E291E227F36635630
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2018-02-26ATH44FDA5BC049D3E351180550353
Verified2018-02-27arnaud44FDA5BC049D3E351161121953
History
DateUserTypeResult
2018-02-27arnaudC-PRP
M1866547/7776448780060252439633 : 44FDA5BC049D3E35
PRP: Verified
PRP without proof (not generated)
2018-02-26ATHC-PRP
M1866547/7776448780060252439633 : 44FDA5BC049D3E35
PRP: Verified
PRP without proof (not generated)
2018-02-26bamF-ECM
Factor: 7776448780060252439633 / (ECM curve 2, B1=50000, B2=5000000)
2018-02-17JossNF-PM1
B1=2149908, B2=77396688, E=12
2017-06-13JossNF-PM1
B1=2149908, B2=38698344, E=12
2017-05-22JossNF-PM1
B1=1791590, B2=17915900, E=12
2017-03-25JossNF-PM1
B1=1492992, B2=14929920, E=12
2017-02-19JossNF-PM1
B1=1244160, B2=12441600, E=12
2017-01-14JossNF-PM1
B1=1036800
2016-12-30JossNF-PM1
B1=864000
2016-12-19JossNF-PM1
B1=720000
2016-11-03JossNF-PM1
B1=600000
2016-10-07JossNF-PM1
B1=500000, B2=39600000, E=6
2016-09-30JossNF-PM1
B1=500000, B2=33000000, E=6
2016-09-05JossNF-PM1
B1=500000, B2=30000000, E=12
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-07Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-09-10ramgeisNF
no factor from 2^65 to 2^66
2015-06-28MadPooC-LL
9F050E291E227F36
2015-05-07snme2pm1NF
no factor from 2^64 to 2^65
2015-05-07snme2pm1NF
no factor from 2^63 to 2^64
2012-01-08markrNF-PM1
B1=275000, B2=6000000, E=12
2011-03-08GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-06Architects CubedNF
no factor from 2^60 to 2^61