8 291 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

No factors below 2⁶⁶

TF target 2⁴⁴

TF below 2^165 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	71000000000
B2 =	267213020773498800

ECM

Estimated T-Level: 51.2 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	3232	0
Verified		George Woltman	75B8C8A553773232	0
Verified		Brian J. Beesley	75B8C8A553773232	0
Verified	2015-04-11	MadPoo	75B8C8A553773232	5400

History

Date	User	Type	Result
2023-08-30	JacobZ	NF-PM1	B1=71000000000, B2=267213020773498800
2023-08-18	masser	NF-PP1	Start=6/5, B1=1010000000, B2=180790000000
2023-07-21	masser	NF-PM1	B1=72000000000, B2=82656994240821000
2023-07-10	masser	NF-PP1	Start=121/61, B1=1010000000, B2=40400000000
2022-02-28	Anton Repko	NF	no factor from 2^64 to 2^66
2021-05-12	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2021-01-22	Ruslan Borisov	NF	no factor from 2^64 to 2^65
2018-09-05	snme2pm1	NF	no factor from 2^63 to 2^64
2016-12-17	snme2pm1	NF	no factor from 2^62 to 2^63
2016-12-11	mikr	NF-PM1	B1=60000000000, B2=4800000000000, E=12
2016-11-17	-Anonymous-	NF-PM1	B1=100000000000, B2=1000000000000, E=12
2016-11-15	-Anonymous-	NF-PM1	B1=40000000000, B2=400000000000, E=12
2016-11-15	-Anonymous-	NF-PM1	B1=20000000000, B2=200000000000, E=12
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-04-11	MadPoo	C-LL	75B8C8A553773232
2015-04-09	snme2pm1	NF	no factor from 2^61 to 2^62
2014-02-12	c10ck3r	NF-PM1	B1=10000000000, B2=200000000000, E=12
2012-11-08	bcp19	NF	no factor from 2^60 to 2^61
2010-08-10	chalsall	NF	no factor from 2^59 to 2^60
2010-08-10	chalsall	NF	no factor from 2^58 to 2^59

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