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

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MnStatusDetails
2131361Factored
FactorDigitsBitsDate
103730653983618542385772373.12020-07-17 17:57:24
ECM
DigitsB1Curves
2550000100 / 280
Estimated T-Level: 21.8
TF below 2^67 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1997-11-12Herb SavageCD4836F5EBBCBF290
Verified (Factored)1999-02-07Kevin BennettCD4836F5EBBCBF291137090
Verified (Factored)2018-04-05kkmrkkblmbrbkCD4836F5EBBCBF29233400
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-07-17ATHAA225866B94DD4A91211802653
Verified2020-07-17oodairaAA225866B94DD4A916608453
History
DateUserTypeResult
2020-07-17oodairaC-PRP
M2131361/10373065398361854238577 : AA225866B94DD4A9
PRP: Verified
PRP without proof (not generated)
2020-07-17ATHC-PRP
M2131361/10373065398361854238577 : AA225866B94DD4A9
PRP: Verified
PRP without proof (not generated)
2020-07-17GANF-ECM
Factor: 10373065398361854238577 / (ECM curve 1, B1=50000, B2=5000000, Sigma=6532403970795200)
2019-04-29TJAOINF
no factor from 2^67 to 2^68
2018-04-05kkmrkkblmbrbkC-LL
CD4836F5EBBCBF29
2017-09-24mikrNF-PM1
B1=2500000, B2=125000000, E=12
2017-08-30JossNF-PM1
B1=504000, B2=5040000, E=6
2017-08-19JossNF-PM1
B1=420000, B2=4200000, E=6
2016-10-29Gordon SpenceNF
no factor from 2^66 to 2^67
2016-06-28JossNF-PM1
B1=210000, B2=6090000, E=12
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-12-27ramgeisNF
no factor from 2^65 to 2^66
2015-03-15VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-15VictordeHollanderNF
no factor from 2^63 to 2^64
2013-09-07ramgeisNF
no factor from 2^62 to 2^63
2012-04-14Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-22James HeinrichNF-PM1
B1=140000, B2=3045000, E=6
2011-01-12JossNF-PM1
B1=50000
2009-01-05Sturle SundeNF
no factor from 2^60 to 2^61