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

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MnStatusDetails
1904891Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
354309727928.4old
2091300146294510739607512477.52020-09-13 03:59:58
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel074A12E03F68ACF1013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-04Oliver Kruse1D12ED208FD847231013
Verified (Factored)2017-11-09ATH1D12ED208FD84723154388013
Verified2020-09-15ViliamF074A12E03F68ACF12114461053
History
DateUserTypeResult
2025-09-03ResolverCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
074A12E03F68ACF1
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2020-09-15Ben DeloCERT
PRP Certification
Proof certified good
2020-09-15ViliamFC-PRP
M1904891/354309727/209130014629451073960751 : 074A12E03F68ACF1
PRP proof power = 7
PRP: Verified
Proof certified good
2020-09-13Dylan DelgadoF-ECM
Factor: 209130014629451073960751 / (ECM curve 4, B1=50000, B2=5000000, Sigma=2725918303806931)
2017-11-09ATHC-PRP
M1904891/354309727 : 1D12ED208FD84723
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1904891/354309727 : 1D12ED208FD84723
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12