42 183 899 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷³

TF target 2⁷²

P-1

B1 =	510000
B2 =	14152500

Status	Date	User	Residue	Shift	Software
Bad	2008-07-12	Charles F. Roberts	60B7298818A9837B	41893260	Linux 32-bit,Prime95,v24 final,(aka Wc2)
Verified	2015-11-02	MadPoo 🙂	CEEE137B4387021C	21461987	Windows 64-bit,Prime95,v26,(aka We4)
Bad	2016-10-15	AirSquirrels	F79ECFD22748AE63	11810180	CUDALucas v2.05.1
Verified	2016-10-26	ATH	CEEE137B4387021C	4438	CUDALucas v2.05.1

History

Date	User	Type	Result
2022-05-01	RichD0	NF	no factor TF: 72-73
2016-10-26	ATH	C-LL	CEEE137B4387021C
2016-10-15	AirSquirrels	C-LL	F79ECFD22748AE63
2015-11-02	MadPoo 🙂	C-LL	CEEE137B4387021C
2015-09-29	AirSquirrels	NF	no factor TF: 71-72
2015-03-14	David Campeau	NF	no factor TF: 70-71
2015-01-20	el grocco	NF	no factor TF: 69-70
2013-12-31	LaurV	NF	no factor TF: 68-69
2008-07-12	CFRoberts	C-LL	60B7298818A9837B
2008-03-22	CFRoberts	NF-PM1	B1=510000, B2=14152500
2007-05-28	smintheus	NF	no factor TF: 1-68