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

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MnStatusDetails
1993241Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
162395959335539023692063.82011-03-05 15:12:37
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 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)Richard WilsonE19145BDC6D5D0690
Verified (Factored)1999-01-17Hans KiesermanE19145BDC6D5D069604338
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel8B6AE3F0B1DDA99E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-05Oliver KruseD23BE7A67A4F485F1013
Verified2017-11-13Chang Chia-TcheD23BE7A67A4F485F1193060113
History
DateUserTypeResult
2025-09-03KrieselCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
8B6AE3F0B1DDA99E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2022-08-15USAFSSNF-PM1
B1=132000, B2=134381520
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-11-13Chang Chia-TcheC-PRP
M1993241/16239595933553902369 : D23BE7A67A4F485F
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1993241/16239595933553902369 : D23BE7A67A4F485F
PRP: Verified
PRP without proof (not generated)
2011-03-05kurlyF-PM1
Factor: 16239595933553902369
2009-12-09S485122NF
no factor from 2^60 to 2^61