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

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MnStatusDetails
2092243Factored
FactorDigitsBitsDate
209090888848923825189217932684.12020-08-15 20:21:31
ECM
DigitsB1Curves
2550000118 / 280
Estimated T-Level: 22.1
TF below 2^68 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)John Lloyd789968F31888D9000
Verified (Factored)1999-03-15Bryan Fullerton789968F31888D9001236238
Verified (Factored)2017-06-12kkmrkkblmbrbk789968F31888D900846347
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-08-15George WoltmanA98CED37746E920C1108515953
Verified2020-08-16marssystemsA98CED37746E920C1207509553
History
DateUserTypeResult
2020-08-16marssystemsC-PRP
M2092243/20909088884892382518921793 : A98CED37746E920C
PRP: Verified
PRP without proof (not generated)
2020-08-15George WoltmanC-PRP
M2092243/20909088884892382518921793 : A98CED37746E920C
PRP: Verified
PRP without proof (not generated)
2020-08-15GANF-ECM
Factor: 20909088884892382518921793 / (ECM curve 1, B1=50000, B2=5000000, Sigma=1509153253698752)
2019-04-01chuenkitNF
no factor from 2^67 to 2^68
2017-06-12kkmrkkblmbrbkC-LL
789968F31888D900
2017-05-11mikrNF-PM1
B1=2500000, B2=125000000, E=12
2016-11-08JossNF-PM1
B1=268329
2016-11-05JossNF-PM1
B1=223608
2016-09-21Gordon SpenceNF
no factor from 2^66 to 2^67
2016-07-27JossNF-PM1
B1=186340, B2=6300000, E=12
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-11-06ramgeisNF
no factor from 2^65 to 2^66
2015-04-10VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-10VictordeHollanderNF
no factor from 2^63 to 2^64
2013-09-03ramgeisNF
no factor from 2^62 to 2^63
2012-03-23Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-19James HeinrichNF-PM1
B1=140000, B2=3150000, E=6
2011-01-08JossNF-PM1
B1=50000
2010-12-28JossNF-PM1
B1=30000
2009-07-27USAFSSNF-PM1
B1=20000, B2=260000
2009-01-03Sturle SundeNF
no factor from 2^60 to 2^61