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

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MnStatusDetails
1902193Factored
FactorDigitsBitsDate
40199464372436392676952492581.72020-12-02 20:53:09
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)Thomas Honold99EDF4675B75893E0
Verified (Factored)1999-03-15Karl Hallowell99EDF4675B75893E840161
Verified (Factored)2015-07-14MadPoo99EDF4675B75893E316027
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-12-02mrh8B919F393820AA251128311053
History
DateUserTypeResult
2020-12-02curtiscCERT
PRP Certification
Proof certified good
2020-12-02mrhC-PRP
M1902193/4019946437243639267695249 : 8B919F393820AA25
PRP proof power = 7
PRP: Verified
Proof certified good
2020-12-02daveward2005F-ECM
Factor: 4019946437243639267695249 / (ECM curve 4, B1=50000, B2=5000000, Sigma=1711930059501405)
2019-04-25chuenkitNF
no factor from 2^67 to 2^68
2017-11-24mikrNF-PM1
B1=8000000, B2=320000000, E=12
2017-03-03Smok_bmv NF
no factor from 2^66 to 2^67
2015-08-30ramgeisNF
no factor from 2^65 to 2^66
2015-07-14MadPooC-LL
99EDF4675B75893E
2015-05-16monstNF
no factor from 2^64 to 2^65
2015-05-16omylistNF
no factor from 2^63 to 2^64
2011-06-19kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2011-02-10Carsten KossendeyNF-PM1
B1=105000, B2=1785000, E=6
2011-01-15GrunwalderGIMPNF
no factor from 2^62 to 2^63
2011-01-15GrunwalderGIMPNF
no factor from 2^61 to 2^62
2009-05-24Architects CubedNF
no factor from 2^60 to 2^61