2 780 507 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁰

TF target 2⁶³

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

P-1

B1 =	52829634
B2 =	1284463520340

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	61 / 640

Estimated T-Level: 25.5 ⓘ

Status	Date	User	Residue	Shift
Verified		Daniel Lake	D528E4700CF08121	0
Verified	1999-05-09	Henk Elbers	D528E4700CF08121	1237398
Verified	2018-08-25	kkmrkkblmbrbk	D528E4700CF08121	2492528

History

Date	User	Type	Result
2025-01-08	yuriy5-1	NF-PM1	B1=52829634, B2=1284463520340
2023-11-17	TJAOI	NF	no factor from 2^69 to 2^70
2023-02-22	Architects Cubed	NF-PM1	B1=5000000, B2=8681331750
2021-07-22	TJAOI	NF	no factor from 2^68 to 2^69
2019-02-24	chuenkit	NF	no factor from 2^67 to 2^68
2018-08-25	kkmrkkblmbrbk	C-LL	D528E4700CF08121
2017-10-16	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-01	mikr	NF-PM1	B1=2700000, B2=84000000, E=12
2017-03-23	Joss	NF-PM1	B1=353341, B2=3533410, E=6
2017-02-25	Joss	NF-PM1	B1=294451, B2=2944510, E=6
2016-12-23	Joss	NF-PM1	B1=204480
2016-10-26	Joss	NF-PM1	B1=170400
2016-08-27	Joss	NF-PM1	B1=142000, B2=4785000, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2015-12-20	omylist	NF	no factor from 2^65 to 2^66
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-03-16	Grant McCracken	NF	no factor from 2^61 to 2^62
2010-11-26	markr	NF-PM1	B1=110000, B2=2392500, E=6
2010-11-10	Joss	NF-PM1	B1=15000
2009-01-28	Sturle Sunde	NF	no factor from 2^60 to 2^61

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