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

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MnStatusDetails
1078151Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
2156303721.0old
19406719824.22008-07-16 09:31:03
209569883000147270332064.22017-02-10 13:32:11
278495709023132430232064.62017-02-10 13:32:11
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 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)2025-09-01Kriesel819BE1579A42D34D013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse1B413641CAA3B40A4013
Verified2017-10-16Oliver Kruse1B413641CAA3B40A464204413
Verified2018-01-02ATH1B413641CAA3B40A467135113
History
DateUserTypeResult
2025-09-01Sparky70CERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
819BE1579A42D34D
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2024-08-22cramsey87NF-PM1
B1=3000000, B2=22221719520
2018-01-02ATHC-PRP
M1078151/2156303/19406719/20956988300014727033/27849570902313243023 : 1B413641CAA3B40A
PRP: Verified
PRP without proof (not generated)
2017-10-16Oliver KruseC-PRP
M1078151/2156303/19406719/27849570902313243023/20956988300014727033 : 1B413641CAA3B40A
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1078151/2156303/19406719/27849570902313243023/20956988300014727033 : 1B413641CAA3B40A
PRP: Verified
PRP without proof (not generated)
2017-09-28Oliver KruseC-PRP
M1078151/2156303/19406719/27849570902313243023/20956988300014727033 : 1B413641CAA3B40A
PRP without proof (not generated)
2017-02-10TJAOIF-ECM
Factor: 20956988300014727033 / (ECM curve 16, B1=50000, B2=5000000)
2017-02-10TJAOIF-ECM
Factor: 27849570902313243023 / (ECM curve 4, B1=50000, B2=5000000)
2008-07-16J FeitsmaF
Factor: 19406719