158 357 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁷

TF target 2⁴⁴

TF below 2^114 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	2147483648
B2 =	1177877301911310

ECM

Estimated T-Level: 35.7 ⓘ

Status	Date	User	Residue	Shift
Verified		Amdahl 6 - 1989	2112580E	0
Verified		Rahn Lieberman	88D9F96C2112580E	0
Verified		Will Edgington	88D9F96C2112580E	0
Verified		Eivind Triel	88D9F96C2112580E	121297
Verified	2016-06-01	MadPoo	88D9F96C2112580E	150981

History

Date	User	Type	Result
2025-01-23	yuriy_5-1	NF-PM1	B1=2147483648, B2=1177877301911310
2023-05-22	JacobZ	NF-PM1	B1=173710726, B2=12453739528230
2023-03-12	Joss	NF-PM1	B1=10001000, B2=125109154170
2023-03-04	masser	NF-PP1	Start=6/5, B1=40000000, B2=1360000000
2023-02-18	masser	NF-PP1	Start=92/29, B1=40000000, B2=1320000000
2023-02-14	masser	NF-PP1	Start=2/7, B1=40000000, B2=1360000000
2022-11-04	Kevin_9611	NF-PM1	B1=5000000, B2=152514712350
2022-11-03	Kevin_9611	NF-PM1	B1=2500000, B2=102947494650
2022-05-11	404_factor_not_found	NF	no factor from 2^66 to 2^67
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-12-06	Gordon Spence	NF	no factor from 2^65 to 2^66
2017-08-28	Conductor	NF	no factor from 2^64 to 2^65
2016-06-01	MadPoo	C-LL	88D9F96C2112580E
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-02-12	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-02-12	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2013-09-13	lycorn	NF	no factor from 2^60 to 2^61
2013-06-17	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2011-03-11	Joss	NF-PM1	B1=10000000
2009-02-06	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-12	axn	NF-PM1	B1=5000000, B2=200000000, E=12
2009-01-03	Sturle Sunde	NF	no factor from 2^58 to 2^59

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