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

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MnStatusDetails
418157Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
513361773104711445.5old
8332955256922288872962712479.52020-06-08 08:18:22
ECM
DigitsB1Curves
2550000280 / 280
30250000200 / 640
Estimated T-Level: 26.6
TF below 2^83 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-09-23Oliver Kruse7140B4275C839CF61013
Verified (Factored)2017-11-02kkmrkkblmbrbk7140B4275C839CF6112522113
Verified (Factored)2020-04-18Oliver Kruse238BFD76F870311B128523553
Verified2020-06-08M Miller238BFD76F870311B2144953
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-04-15tophfactor ECM small0.00 % 2025-05-05
History
DateUserTypeResult
2020-06-08M MillerC-PRP
M418157/51336177310471/833295525692228887296271 : 238BFD76F870311B
PRP: Verified
PRP without proof (small exponent)
2020-06-08TJAOIF-ECM
Factor: 833295525692228887296271 / (ECM curve 23, B1=250000, B2=25000000)
2020-04-18Oliver KruseC-PRP
M418157/51336177310471 : 238BFD76F870311B
PRP: Verified
PRP without proof (small exponent)
2017-11-02kkmrkkblmbrbkC-PRP
M418157/51336177310471 : 7140B4275C839CF6
PRP: Verified
PRP without proof (small exponent)
2017-09-23Oliver KruseC-PRP
M418157/51336177310471 : 7140B4275C839CF6
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=3000000, B2=100000000, E=12