108 959 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 2^118 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10000000000
B2 =	671544773439540

ECM

Estimated T-Level: 37.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	5A72	0
Verified		Jay R. Hill	77D536EB46BE5A72	0
Verified		Brian J. Beesley	77D536EB46BE5A72	0
Verified		Eivind Triel	77D536EB46BE5A72	106759
Verified	2016-06-01	MadPoo	77D536EB46BE5A72	45898

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-08-28	-Anonymous-	factor ECM small		0.00 %	2025-08-28
2025-05-06	-Anonymous-	factor ECM small	C1S2	0.00 %	2025-10-17

History

Date	User	Type	Result
2023-05-14	tim s	NF	no factor from 2^67 to 2^68
2023-03-06	masser	NF-PP1	Start=6/5, B1=60000000, B2=2160000000
2023-02-27	Oliver Kruse	NF-PM1	B1=10000000000, B2=671544773439540
2023-02-24	Joss	NF-PM1	B1=1000000, B2=370915575030
2023-02-20	masser	NF-PP1	Start=87/47, B1=60000000, B2=2100000000
2023-02-15	masser	NF-PP1	Start=2/7, B1=60000000, B2=1800000000
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2020-01-29	Gordon Spence	NF	no factor from 2^66 to 2^67
2019-06-02	Yxinity	NF	no factor from 2^65 to 2^66
2018-05-18	chuenkit	NF	no factor from 2^64 to 2^65
2018-03-29	mikr	NF-PM1	B1=1000000000, B2=60000000000, E=12
2016-06-01	MadPoo	C-LL	77D536EB46BE5A72
2016-03-06	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-03-06	Gordon Spence	NF	no factor from 2^62 to 2^63
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2013-10-04	lycorn	NF	no factor from 2^60 to 2^61
2012-12-17	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2009-01-17	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59

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