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

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MnStatusDetails
2883911Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
437584225698357598598367292685.22025-01-01 16:11:25
ECM
DigitsB1Curves
2550000280 / 280
3025000071 / 640
Estimated T-Level: 25.6
TF below 2^80 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)John LloydE0515D95490AE28E0
Verified (Factored)1999-05-09Alastair KnoxE0515D95490AE28E2392522
Verified (Factored)2018-09-25kkmrkkblmbrbkE0515D95490AE28E223072
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2025-01-01fordobrC01325E417DD14811195200353
History
DateUserTypeResult
2025-01-01colossalfossilCERT
PRP Certification
Proof certified good
2025-01-01fordobrC-PRP
M2883911/43758422569835759859836729 : C01325E417DD1481
PRP proof power = 7
PRP: Verified
Proof certified good
2025-01-01fordobrF-ECM
Factor: 43758422569835759859836729 / (ECM curve 35, B1=142093, B2=275660385, Edwards Sigma=8516494297770216)
2024-06-09JossNF-PM1
B1=10000000, B2=20391172620
2023-11-13JossNF-PM1
B1=2606196, B2=5620805190
2023-10-03JossNF-PM1
B1=1000000, B2=9556867320
2023-09-14JossNF-PM1
B1=1000000, B2=4673628960
2023-07-17TJAOINF
no factor from 2^69 to 2^70
2023-05-25JossNF-PM1
B1=1000000, B2=2232009780
2021-05-06TJAOINF
no factor from 2^68 to 2^69
2020-02-22masserNF-PM1
B1=5000000, B2=200000000, E=12
2019-10-19masserNF-PM1
B1=2900000, B2=29000000, E=12
2019-01-11chuenkitNF
no factor from 2^67 to 2^68
2018-09-25kkmrkkblmbrbkC-LL
E0515D95490AE28E
2018-09-12JossNF-PM1
B1=742484, B2=3712420
2018-09-05JossNF-PM1
B1=742484, B2=2227452, E=4
2018-09-03JossNF-PM1
B1=742484, B2=1484968, E=6
2018-01-22JossNF-PM1
B1=577070
2017-11-13Gordon SpenceNF
no factor from 2^66 to 2^67
2017-03-15JossNF-PM1
B1=333954, B2=3339540, E=6
2016-10-07JossNF-PM1
B1=120000, B2=3960000
2016-09-22JossNF-PM1
B1=120000, B2=3300000, E=6
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2015-11-11omylistNF
no factor from 2^65 to 2^66
2015-04-21VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-21VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-10dbaughNF
no factor from 2^62 to 2^63
2012-01-14Grant McCrackenNF
no factor from 2^61 to 2^62
2009-02-14Sturle SundeNF
no factor from 2^60 to 2^61