43 281 731 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 2⁷⁴

TF target 2⁷²

P-1

B1 =	425000
B2 =	3293750

Status	Date	User	Residue	Shift	Software
Verified	2008-09-24	Jean Ferry	3C986117E4D9D842	674214	Windows,Prime95,v24 final,(aka Wc1)
Verified	2015-11-24	ATH	3C986117E4D9D842	32833315	Windows 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2020-01-05	-anonymous-	NF	no factor TF: 73-74
2019-09-30	-anonymous-	NF	no factor TF: 72-73
2015-11-24	ATH	C-LL	3C986117E4D9D842
2015-08-20	Sid & Andy	NF	no factor TF: 71-72
2015-08-20	Sid & Andy	NF	no factor TF: 70-71
2015-04-01	LaurV	NF	no factor TF: 69-70
2008-09-23	-anonymous-	C-LL	3C986117E4D9D842
2008-08-26	-anonymous-	NF-PM1	B1=425000, B2=3293750
2007-11-17	cmarble	NF	no factor TF: 1-69