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

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MnStatusDetails
2049409Factored
FactorDigitsBitsDate
36216260079078687891721672581.62018-09-27 22:52:48
ECM
DigitsB1Curves
2550000113 / 280
Estimated T-Level: 22.0 ⓘ
TF below 2^68 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Steve Potocny213624E55998E58A0
Verified (Factored)1999-01-17Ethan O'Connor213624E55998E58A1297741
Verified (Factored)2016-07-15Mark Rose213624E55998E58A1263691
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2018-10-01Oliver Kruse11981C7E88C31D05183083953
Verified2018-10-01ATH11981C7E88C31D051134592753
History
DateUserTypeResult
2018-10-01ATHC-PRP
M2049409/3621626007907868789172167 : 11981C7E88C31D05
PRP: Verified
PRP without proof (not generated)
2018-10-01Oliver KruseC-PRP
M2049409/3621626007907868789172167 : 11981C7E88C31D05
PRP: Verified
PRP without proof (not generated)
2018-09-27bamF-ECM
Factor: 3621626007907868789172167 / (ECM curve 1, B1=50000, B2=5000000)
2016-08-10Gordon SpenceNF
no factor from 2^66 to 2^67
2016-07-15Mark RoseC-LL
213624E55998E58A
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-11-03ramgeisNF
no factor from 2^65 to 2^66
2015-10-06Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-04-13VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-13VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-22JossNF-PM1
B1=166318
2013-09-01ramgeisNF
no factor from 2^62 to 2^63
2012-02-29Sebastian HornbostelNF
no factor from 2^61 to 2^62
2012-01-06Squeeky_SquirrelNF-PM1
B1=135000, B2=2868750, E=6
2011-01-04JossNF-PM1
B1=50000
2010-12-28JossNF-PM1
B1=30000
2009-01-03Sturle SundeNF
no factor from 2^60 to 2^61