2 832 257 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 2^80 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10000000
B2 =	20521471740

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	68 / 640

Estimated T-Level: 25.5 ⓘ

Status	Date	User	Residue	Shift
Verified		Dax Prather	04D17972387F40D4	0
Verified	1998-07-21	Paul Victor Novarese	04D17972387F40D4	0
Verified	1999-07-27	Stephen Wood	04D17972387F40D4	529374

History

Date	User	Type	Result
2024-05-28	Joss	NF-PM1	B1=10000000, B2=20521471740
2023-10-29	Joss	NF-PM1	B1=2625106, B2=5503103760
2023-10-10	Joss	NF-PM1	B1=2625106, B2=3024564270
2023-09-15	Joss	NF-PM1	B1=1000000, B2=5765609850
2023-07-31	TJAOI	NF	no factor from 2^69 to 2^70
2023-06-08	Joss	NF-PM1	B1=1000000, B2=2873961090
2023-03-03	Joss	NF-PM1	B1=1000000, B2=432341910
2021-04-29	TJAOI	NF	no factor from 2^68 to 2^69
2020-01-29	masser	NF-PM1	B1=5000000, B2=200000000, E=12
2019-11-04	masser	NF-PM1	B1=2840000, B2=28400000, E=12
2019-01-04	chuenkit	NF	no factor from 2^67 to 2^68
2017-10-28	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-10-11	Joss	NF-PM1	B1=597196, B2=5971960, E=6
2017-02-25	Joss	NF-PM1	B1=298598, B2=2985980, E=6
2016-12-23	Joss	NF-PM1	B1=207360
2016-12-15	Joss	NF-PM1	B1=172800
2016-09-22	Joss	NF-PM1	B1=120000, B2=3993000
2016-09-21	Joss	NF-PM1	B1=120000, B2=3630000
2016-09-19	Joss	NF-PM1	B1=120000, B2=3300000, E=6
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-11-30	omylist	NF	no factor from 2^65 to 2^66
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-02-12	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61

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