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

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MnStatusDetails
1922957Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
48727730391032.2old
34573577693527878345866172581.52024-02-05 10:44:22
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 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)2025-09-02Kriesel4E4CFF5579F202A9013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-04Oliver KruseCCEC41456733ADFA1013
Verified (Factored)2017-11-10ATHCCEC41456733ADFA1145569613
Verified2024-02-05Naegi Makoto4E4CFF5579F202A9288274153
History
DateUserTypeResult
2025-09-03Chris WonsonCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
4E4CFF5579F202A9
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2024-02-05RSBriggsCERT
PRP Certification
Proof certified good
2024-02-05Naegi MakotoC-PRP
M1922957/4872773039/3457357769352787834586617 : 4E4CFF5579F202A9
PRP proof power = 7
PRP: Verified
Proof certified good
2024-02-05TJAOIF-ECM
Factor: 3457357769352787834586617 / (ECM curve 37, B1=250000, B2=40000000, Sigma=3760136970371376)
2017-11-10ATHC-PRP
M1922957/4872773039 : CCEC41456733ADFA
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1922957/4872773039 : CCEC41456733ADFA
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12