26 597 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 2^153 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	15000000000
B2 =	1503300157088730

ECM

Estimated T-Level: 47.6 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	401A	0
Verified		George Woltman	CFCECA9D4062C01A	0
Verified		Brian J. Beesley	CFCECA9D4062C01A	0
Verified	2015-04-11	MadPoo	CFCECA9D4062C01A	13410

History

Date	User	Type	Result
2023-08-20	masser	NF-PP1	Start=6/5, B1=270000000, B2=48330000000
2023-07-07	masser	NF-PP1	Start=148/47, B1=270000000, B2=10800000000
2022-07-02	ATH	NF-PM1	B1=15000000000, B2=1503300157088730
2021-05-07	ATH	NF-PP1	Start=2/7, B1=500000000, B2=101500000000
2020-07-05	Yxinity	NF	no factor from 2^65 to 2^66
2020-07-05	Yxinity	NF	no factor from 2^65 to 2^66
2019-04-05	Yxinity	NF	no factor from 2^64 to 2^65
2019-04-05	Yxinity	NF	no factor from 2^64 to 2^65
2018-04-06	Yxinity	NF	no factor from 2^63 to 2^64
2018-04-06	Yxinity	NF	no factor from 2^63 to 2^64
2017-04-26	mikr	NF-PM1	B1=12000000000, B2=960000000000, E=12
2016-12-18	kkmrkkblmbrbk	NF-PM1	B1=1000000000
2016-12-18	kkmrkkblmbrbk	NF-PM1	B1=500000000
2016-09-11	Sid & Andy	NF	no factor from 2^62 to 2^63
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-04-11	MadPoo	C-LL	CFCECA9D4062C01A
2013-11-18	David Campeau	NF-PM1	B1=761580000
2013-11-15	David Campeau	NF-PM1	B1=609265000
2013-11-05	David Campeau	NF-PM1	B1=456950000, B2=10256100000, E=12
2013-11-03	David Campeau	NF-PM1	B1=456950000
2013-10-25	David Campeau	NF-PM1	B1=304635000
2012-04-02	bcp19	NF	no factor from 2^61 to 2^62
2012-04-02	bcp19	NF	no factor from 2^60 to 2^61
2009-01-31	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-18	Sturle Sunde	NF	no factor from 2^58 to 2^59

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