2 981 837 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 2^78 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	56654904
B2 =	1284463520340

ECM

Digits	B1	Curves
25	50000	280 / 280

Estimated T-Level: 25.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Claude Barbe	0051910EDBCDB7F2	0
Verified	2000-02-01	Ambrogio De Lorenzo	0051910EDBCDB7F2	34746
Verified	2018-10-20	kkmrkkblmbrbk	0051910EDBCDB7F2	1445859

History

Date	User	Type	Result
2024-12-16	yuriy_5-1	NF-PM1	B1=56654904, B2=1284463520340
2023-08-31	Tha	NF-PM1	B1=5000000, B2=28404656280
2023-06-03	Joss	NF-PM1	B1=1000000, B2=1840268430
2023-04-20	TJAOI	NF	no factor from 2^69 to 2^70
2022-12-05	Joss	NF-PM1	B1=1000000, B2=284427990
2021-05-04	TJAOI	NF	no factor from 2^68 to 2^69
2018-12-27	chuenkit	NF	no factor from 2^67 to 2^68
2018-10-20	kkmrkkblmbrbk	C-LL	0051910EDBCDB7F2
2018-09-30	Joss	NF-PM1	B1=2981837, B2=29818370, E=12
2018-02-22	Joss	NF-PM1	B1=2981837, B2=5963674, E=6
2018-02-21	Joss	NF-PM1	B1=2969370
2018-02-20	Joss	NF-PM1	B1=2474475
2018-01-24	Joss	NF-PM1	B1=647031
2017-12-03	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-27	omylist	NF	no factor from 2^65 to 2^66
2016-02-24	Joss	NF-PM1	B1=312034, B2=3120340, E=6
2015-04-13	lycorn	NF	no factor from 2^64 to 2^65
2015-04-13	lycorn	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-11-25	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-10-25	markr	NF-PM1	B1=95000, B2=1995000, E=6
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61

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