2 851 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁶

TF target 2⁴⁴

TF below 2^218 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	6000000000000
B2 =	9223372036854775807

ECM

Estimated T-Level: 67.2 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	66DD	0
Verified		George Woltman	7982D1CA51BEE6DD	0
Verified		Brian J. Beesley	7982D1CA51BEE6DD	0
Verified	2015-04-11	MadPoo	7982D1CA51BEE6DD	2773

History

Date	User	Type	Result
2024-10-20	-Anonymous-	NF-PM1	B1=6000000000000, B2=14003059100843052240
2023-08-11	masser	NF-PP1	Start=6/5, B1=3390000000, B2=606810000000
2023-08-10	masser	NF-PP1	Start=2/7, B1=3390000000, B2=606810000000
2023-07-16	masser	NF-PP1	Start=90/23, B1=3390000000, B2=135600000000
2023-07-06	masser	NF-PM1	B1=216000000000, B2=407260548568773900
2023-02-09	Joss	NF-PM1	B1=63000000000, B2=100103983685375670
2023-02-08	Joss	NF-PM1	B1=63000000000, B2=6479091987117750
2023-02-08	Joss	NF-PM1	B1=63000000000, B2=186371985249450
2022-07-11	Anton Repko	NF	no factor from 2^65 to 2^66
2021-08-17	H Michaelson	NF-PP1	Start=2/7, B1=1000000, B2=100000000
2021-01-13	Anton Repko	NF	no factor from 2^64 to 2^65
2018-03-18	snme2pm1	NF	no factor from 2^63 to 2^64
2016-10-09	snme2pm1	NF	no factor from 2^62 to 2^63
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-07-18	snme2pm1	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	7982D1CA51BEE6DD
2014-10-01	James Hintz	NF-PM1	B1=100000000000, B2=10000000000000, E=12
2013-11-15	David Campeau	NF-PM1	B1=11788975000
2012-08-02	bcp19	NF	no factor from 2^60 to 2^61
2011-04-17	Joss	NF-PM1	B1=10000000000
2011-01-10	monst	NF	no factor from 2^58 to 2^60

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