2 897 731 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁰

TF target 2⁶³

TF below 2^75 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10000000
B2 =	10168479090

ECM

Digits	B1	Curves
25	50000	231 / 280

Estimated T-Level: 24.1 ⓘ

Status	Date	User	Residue	Shift
Verified		Thomas Honold	8FF605C6039FB21B	0
Verified	1999-05-02	Greg Hogan	8FF605C6039FB21B	2778051
Verified	2018-09-29	kkmrkkblmbrbk	8FF605C6039FB21B	1486557

History

Date	User	Type	Result
2025-04-16	Joss	NF-PM1	B1=10000000, B2=10168479090
2024-01-31	Joss	NF-PM1	B1=5202434, B2=10584510090
2023-10-27	Joss	NF-PM1	B1=2601218, B2=2744127540
2023-09-27	Joss	NF-PM1	B1=1000000, B2=6922522530
2023-05-25	Joss	NF-PM1	B1=1000000, B2=3303884430
2023-05-05	TJAOI	NF	no factor from 2^69 to 2^70
2021-04-22	TJAOI	NF	no factor from 2^68 to 2^69
2020-02-16	masser	NF-PM1	B1=5000000, B2=200000000, E=12
2019-11-04	masser	NF-PM1	B1=2900000, B2=29000000, E=12
2019-01-12	chuenkit	NF	no factor from 2^67 to 2^68
2018-09-29	kkmrkkblmbrbk	C-LL	8FF605C6039FB21B
2017-11-16	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-08-19	Joss	NF-PM1	B1=400000, B2=4000000, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-02-19	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-22	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-22	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-01-10	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-02-07	Carsten Kossendey	NF-PM1	B1=200000, B2=5000000, E=6
2010-12-24	Joss	NF-PM1	B1=20000
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=168750
2009-02-12	Sturle Sunde	NF	no factor from 2^60 to 2^61

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