2 951 957 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁰

TF target 2⁶⁴

TF below 2^81 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10000000
B2 =	19214984250

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Karl Kamin	094DDBA926BFDFDE	0
Verified	1999-07-27	Derek Wegner	094DDBA926BFDFDE	2830138
Verified	2018-10-12	kkmrkkblmbrbk	094DDBA926BFDFDE	1334364

History

Date	User	Type	Result
2023-07-31	TJAOI	NF	no factor from 2^69 to 2^70
2023-03-01	mikr	NF-PM1	B1=10000000, B2=19214984250
2022-08-28	Wentao Huang	NF-PM1	B1=1380000, B2=4022278260
2021-05-12	TJAOI	NF	no factor from 2^68 to 2^69
2018-12-24	chuenkit	NF	no factor from 2^67 to 2^68
2018-10-12	kkmrkkblmbrbk	C-LL	094DDBA926BFDFDE
2017-11-28	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-09-05	Joss	NF-PM1	B1=1149847, B2=22000000, E=12
2016-02-25	ramgeis	NF	no factor from 2^65 to 2^66
2015-05-08	VictordeHollander	NF-PM1	B1=1000000, B2=20000000, E=12
2015-05-07	Joss	NF-PM1	B1=1045316
2015-05-01	Joss	NF-PM1	B1=950288
2015-04-27	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-27	VictordeHollander	NF	no factor from 2^63 to 2^64
2015-04-08	Joss	NF-PM1	B1=785363
2015-03-29	Joss	NF-PM1	B1=713967
2015-03-14	Joss	NF-PM1	B1=590056
2015-03-10	Joss	NF-PM1	B1=536415
2015-03-02	Joss	NF-PM1	B1=487650
2015-02-23	Joss	NF-PM1	B1=443319
2015-02-15	Joss	NF-PM1	B1=403018
2015-02-13	Joss	NF-PM1	B1=366380
2015-02-11	Joss	NF-PM1	B1=333073
2015-02-03	Joss	NF-PM1	B1=206814
2015-02-01	Joss	NF-PM1	B1=188013
2015-01-31	Joss	NF-PM1	B1=170921
2015-01-26	Joss	NF-PM1	B1=141258
2014-11-10	Joss	NF-PM1	B1=116743
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-12-20	markr	NF	no factor from 2^61 to 2^62
2010-11-03	markr	NF-PM1	B1=95000, B2=1971250, E=6
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61

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