42 222 473 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 =	465000
B2 =	11625000

Status	Date	User	Residue	Shift	Software
Bad	2009-06-11	Will Wilkinson	70A52583EC95534B	3661409	Windows 64-bit,Prime95,v25.9,build 4
Verified	2015-11-04	MadPoo 🙂	77949F0F9152155A	27560119	Windows 64-bit,Prime95,v26,(aka We4)
Bad	2016-10-16	AirSquirrels	A3C37E13EF93748F	26673003	CUDALucas v2.05.1
Verified	2016-10-27	ATH	77949F0F9152155A	21120048	CUDALucas v2.05.1

History

Date	User	Type	Result
2022-04-22	RichD0	NF	no factor TF: 72-73
2016-10-30	Bruno Victal	NF-PM1	B1=465000, B2=11625000, E=12
2016-10-27	ATH	C-LL	77949F0F9152155A
2016-10-16	AirSquirrels	C-LL	A3C37E13EF93748F
2015-11-04	MadPoo 🙂	C-LL	77949F0F9152155A
2015-08-31	AirSquirrels	NF	no factor TF: 71-72
2015-03-16	Mark Rose	NF	no factor TF: 70-71
2015-01-20	Mark Rose	NF	no factor TF: 69-70
2014-01-07	Torben K.	NF	no factor TF: 68-69
2009-06-11	Will Wilkinson	C-LL	70A52583EC95534B
2008-07-04	-anonymous-	NF-PM1	B1=710000
2007-06-15	-anonymous-	NF	no factor TF: 1-68