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

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MnStatusDetails
1981099Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
3392909391371238.3old
88676185980716171653.02014-08-31 10:15:23
63030163210234216541992272.42022-08-09 09:42:58
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.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel29A1DACDE0E22085013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-02alpertron26D031514BE4AF992013
Verified (Factored)2017-10-20Oliver Kruse26D031514BE4AF99264823713
Verified2022-08-10LordJulius29A1DACDE0E22085353622553
History
DateUserTypeResult
2025-09-030xCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
29A1DACDE0E22085
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2025-07-29USAFSSNF-PM1
B1=1680000, B2=19244154930
2022-08-13USAFSSNF-PM1
B1=132000, B2=134381520
2022-08-10ANONYMOUSCERT
PRP Certification
Proof certified good
2022-08-10LordJuliusC-PRP
M1981099/339290939137/8867618598071617/6303016321023421654199 : 29A1DACDE0E22085
PRP proof power = 7
PRP: Verified
Proof certified good
2022-08-09TJAOIF-ECM
Factor: 6303016321023421654199 / (ECM curve 1, B1=50000, B2=7500000)
2017-10-20Oliver KruseC-PRP
M1981099/339290939137/8867618598071617 : 26D031514BE4AF99
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-02alpertronC-PRP
M1981099/339290939137/8867618598071617 : 26D031514BE4AF99
PRP: Verified (Factored)
PRP without proof (not generated)
2014-08-31TJAOIF
Factor: 8867618598071617