172 351 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁶

TF target 2⁴⁴

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

P-1

B1 =	157758653
B2 =	11106241236090

ECM

Estimated T-Level: 35.7 ⓘ

Status	Date	User	Residue	Shift
Verified		Amdahl 6 - 1989	3A8037CB	0
Verified		Sergio Filippini	7A6B18DD7A8037CB	0
Verified		Brian J. Beesley	7A6B18DD7A8037CB	0
Verified		Eivind Triel	7A6B18DD7A8037CB	38085
Verified	2016-06-01	MadPoo	7A6B18DD7A8037CB	127179

History

Date	User	Type	Result
2023-05-08	JacobZ	NF-PM1	B1=157758653, B2=11106241236090
2023-03-12	Joss	NF-PM1	B1=1000000, B2=125109154170
2023-03-02	masser	NF-PP1	Start=6/5, B1=40000000, B2=1360000000
2023-02-16	masser	NF-PP1	Start=81/59, B1=40000000, B2=1320000000
2023-02-13	masser	NF-PP1	Start=2/7, B1=40000000, B2=1360000000
2022-11-03	Kevin_9611	NF-PM1	B1=5000000, B2=151877325600
2022-11-02	Kevin_9611	NF-PM1	B1=2500000, B2=101704673070
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2020-01-10	Yxinity	NF	no factor from 2^65 to 2^66
2018-04-23	BloodERazor	NF	no factor from 2^64 to 2^65
2016-06-01	MadPoo	C-LL	7A6B18DD7A8037CB
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-21	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-21	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2013-08-20	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2013-08-14	lycorn	NF	no factor from 2^60 to 2^61
2009-01-28	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-21	axn	NF-PM1	B1=5000000, B2=200000000, E=12
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59

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