393 073 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁸

TF target 2⁴⁴

TF below 2^97 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	72000000
B2 =	3664876665450

ECM

Estimated T-Level: 30.6 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	28CC	0
Verified		Jeffrey Wolfe	0D6079EC67A2A8CC	0
Verified		Matt Horbal	0D6079EC67A2A8CC	0
Verified		Eivind Triel	0D6079EC67A2A8CC	320665
Verified	2016-06-01	MadPoo	0D6079EC67A2A8CC	179952

History

Date	User	Type	Result
2023-08-04	JacobZ	NF-PM1	B1=72000000, B2=3664876665450
2023-07-21	Joss	NF-PM1	B1=1000000, B2=68245727550
2023-03-31	Gordon Spence	NF	no factor from 2^67 to 2^68
2023-02-07	Joss	NF-PM1	B1=1000000, B2=28509731250
2023-01-10	masser	NF-PP1	Start=6/5, B1=20000000, B2=640000000
2023-01-01	masser	NF-PP1	Start=189/19, B1=20000000, B2=620000000
2023-01-01	masser	NF-PP1	Start=2/7, B1=20000000, B2=640000000
2022-12-14	LordJulius	NF	no factor from 2^67 to 2^68
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2022-03-04	Yxinity	NF	no factor from 2^66 to 2^67
2019-05-13	Yxinity	NF	no factor from 2^65 to 2^66
2018-01-18	BloodERazor	NF	no factor from 2^64 to 2^65
2017-01-19	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2016-06-01	MadPoo	C-LL	0D6079EC67A2A8CC
2015-11-19	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-19	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2012-07-15	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2011-11-11	lycorn	NF	no factor from 2^60 to 2^61
2009-01-12	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-28	Sturle Sunde	NF	no factor from 2^58 to 2^59

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