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

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MnStatusDetails
1821583Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
111772332891133.4old
1492694054511053330496997221673096.92021-03-26 16:50:28
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)2025-09-02Kriesel8C30415C5141086B013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-03Oliver KruseD314AB3E6249B21A1013
Verified (Factored)2017-11-06kkmrkkblmbrbkD314AB3E6249B21A1150337213
Verified2021-03-27Oliver Kruse8C30415C5141086B2154401453
History
DateUserTypeResult
2025-09-03coffeeguyCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
8C30415C5141086B
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2021-03-27curtiscCERT
PRP Certification
Proof certified good
2021-03-27Oliver KruseC-PRP
M1821583/11177233289/149269405451105333049699722167 : 8C30415C5141086B
PRP proof power = 7
PRP: Verified
Proof certified good
2021-03-26TJAOIF-ECM
Factor: 149269405451105333049699722167 / (ECM curve 57, B1=50000, B2=6600000)
2017-11-06kkmrkkblmbrbkC-PRP
M1821583/11177233289 : D314AB3E6249B21A
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1821583/11177233289 : D314AB3E6249B21A
PRP: Verified (Factored)
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12