2 883 911 Exponent Status

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁷⁰

TF target 2⁶³

Factored

Factor	Digits	Bits	Date
43758422569835759859836729	26	85.2	2025-01-01 16:11:25

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	71 / 640

Estimated T-Level: 25.6 ⓘ

TF below 2^80 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		John Lloyd	E0515D95490AE28E	0	Windows,Prime95,v14,(aka WQ1)
Factored	1999-05-09	Alastair Knox	E0515D95490AE28E	2392522	Windows,Prime95,v18,(aka WU1)
Factored	2018-09-25	kkmrkkblmbrbk	E0515D95490AE28E	223072	Windows 64-bit,Prime95,v29.4,build 5

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	Certified Good	2025-01-01	Andrey Dobrynin	C01325E417DD1481	1	1952003	5	3

History

Date	User	Type	Result
2025-01-01	colossalfossil	CERT	Proof certified good
2025-01-01	Andrey Dobrynin	C-PRP	Proof Certified Good Proof Power: 7
2025-01-01	Andrey Dobrynin	F-ECM	Factor: 43758422569835759859836729 / ECM curve 35, B1=142093, B2=275660385, Edwards Sigma=8516494297770216
2024-06-09	Joss	NF-PM1	B1=10000000, B2=20391172620
2023-11-13	Joss	NF-PM1	B1=2606196, B2=5620805190
2023-10-03	Joss	NF-PM1	B1=1000000, B2=9556867320
2023-09-14	Joss	NF-PM1	B1=1000000, B2=4673628960
2023-07-17	TJAOI	NF	no factor TF: 69-70
2023-05-25	Joss	NF-PM1	B1=1000000, B2=2232009780
2021-05-06	TJAOI	NF	no factor TF: 68-69
2020-02-22	masser	NF-PM1	B1=5000000, B2=200000000, E=12
2019-10-19	masser	NF-PM1	B1=2900000, B2=29000000, E=12
2019-01-11	chuenkit	NF	no factor TF: 67-68
2018-09-25	kkmrkkblmbrbk	C-LL	E0515D95490AE28E
2018-09-12	Joss	NF-PM1	B1=742484, B2=3712420
2018-09-05	Joss	NF-PM1	B1=742484, B2=2227452, E=4
2018-09-03	Joss	NF-PM1	B1=742484, B2=1484968, E=6
2018-01-22	Joss	NF-PM1	B1=577070
2017-11-13	Gordon Spence	NF	no factor TF: 66-67
2017-03-15	Joss	NF-PM1	B1=333954, B2=3339540, E=6
2016-10-07	Joss	NF-PM1	B1=120000, B2=3960000
2016-09-22	Joss	NF-PM1	B1=120000, B2=3300000, E=6
2016-02-23	Mark Rose	NF	no factor TF: 1-60
2015-11-11	omylist	NF	no factor TF: 65-66
2015-04-21	VictordeHollander	NF	no factor TF: 64-65
2015-04-21	VictordeHollander	NF	no factor TF: 63-64
2013-01-10	dbaugh	NF	no factor TF: 62-63
2012-01-14	Grant McCracken	NF	no factor TF: 61-62
2009-02-14	Sturle Sunde	NF	no factor TF: 60-61
2003-11-28	-anonymous-	NF-PM1	B1=2048, B2=204800
1999-05-09	-anonymous-	C-LL	E0515D95490AE28E

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