2 143 487 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

2143487

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁰

TF target 2⁶²

TF below 2^82 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10000000
B2 =	30495202920

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	166 / 640

Estimated T-Level: 26.3 ⓘ

Status	Date	User	Residue	Shift
Verified		Paul McJones	F4BC1FB922D36C45	0
Verified	1999-02-14	Brian Jongekryg	F4BC1FB922D36C45	1254432
Verified	2018-04-07	kkmrkkblmbrbk	F4BC1FB922D36C45	1506650

History

Date	User	Type	Result
2025-06-17	Joss	NF-PM1	B1=10000000, B2=30495202920
2025-03-12	Joss	NF-PM1	B1=10000000, B2=20434912680
2025-02-06	Joss	NF-PM1	B1=10000000, B2=10374622440
2023-11-07	Joss	NF-PM1	B1=2934617, B2=2961609420
2023-02-09	Architects Cubed	NF	no factor from 2^69 to 2^70
2023-01-02	Architects Cubed	NF-PM1	B1=5000000, B2=9896994030
2021-08-02	TJAOI	NF	no factor from 2^68 to 2^69
2019-09-23	mikr	NF-PM1	B1=4000000, B2=200000000, E=12
2019-04-15	TJAOI	NF	no factor from 2^67 to 2^68
2018-04-07	kkmrkkblmbrbk	C-LL	F4BC1FB922D36C45
2018-02-27	Joss	NF-PM1	B1=2175385, B2=4350770, E=6
2016-10-29	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-07-13	Joss	NF-PM1	B1=2165385, B2=4330770, E=6
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-12-27	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-07	Joss	NF-PM1	B1=2165385
2015-06-25	Joss	NF-PM1	B1=1968532
2015-06-08	Joss	NF-PM1	B1=1789575
2015-05-26	Joss	NF-PM1	B1=1626887
2015-05-22	Joss	NF-PM1	B1=1478989
2015-05-01	Joss	NF-PM1	B1=1344536
2015-04-08	Joss	NF-PM1	B1=1111188
2015-03-29	Joss	NF-PM1	B1=1010171
2015-03-18	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-18	VictordeHollander	NF	no factor from 2^63 to 2^64
2015-03-15	Joss	NF-PM1	B1=834853
2015-03-12	Joss	NF-PM1	B1=758958
2015-03-02	Joss	NF-PM1	B1=689962
2015-02-25	Joss	NF-PM1	B1=627239
2015-02-16	Joss	NF-PM1	B1=570218
2015-02-15	Joss	NF-PM1	B1=518380
2015-02-12	Joss	NF-PM1	B1=471255
2015-02-01	Joss	NF-PM1	B1=266013
2015-01-31	Joss	NF-PM1	B1=241830
2015-01-30	Joss	NF-PM1	B1=219846
2015-01-29	Joss	NF-PM1	B1=199860
2014-10-28	Joss	NF-PM1	B1=159888
2014-08-15	-Anonymous-	NF-PM1	B1=129944
2013-02-21	dbaugh	NF	no factor from 2^62 to 2^63
2009-01-07	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-05	Sturle Sunde	NF	no factor from 2^60 to 2^61

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