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

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MnStatusDetails
1987693Factored
FactorDigitsBitsDate
160449165287807569468063612683.72011-01-28 15:49:35
ECM
DigitsB1Curves
2550000280 / 280
3025000059 / 640
Estimated T-Level: 25.5 ⓘ
TF below 2^80 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Edward Wahl05ABF53CE7D2C30E0
Verified (Factored)Edesio Costa e Silva05ABF53CE7D2C30E0
Verified (Factored)1999-01-02Kai-ming Poon05ABF53CE7D2C30E194780
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-05Oliver KruseC6B5D2B88C6B519E1013
Verified2017-11-12Chang Chia-TcheC6B5D2B88C6B519E193381413
History
DateUserTypeResult
2022-08-14USAFSSNF-PM1
B1=132000, B2=134381520
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-11-12Chang Chia-TcheC-PRP
M1987693/16044916528780756946806361 : C6B5D2B88C6B519E
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1987693/16044916528780756946806361 : C6B5D2B88C6B519E
PRP: Verified
PRP without proof (not generated)
2011-01-28kurlyF-PM1
Factor: 16044916528780756946806361
2009-12-14S485122NF
no factor from 2^60 to 2^61