41 389 217 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 =	500000
B2 =	14875000

Status	Date	User	Residue	Shift	Software
Bad	2009-03-23	davy	0C1D644E021E71F9	17547725	Windows 64-bit,Prime95,v25.9,build 4
Verified	2016-12-02	George Woltman	EE938375BED05C20	33597669	Mac OS X 64-bit,Prime95,v28.7,build 1
Verified	2016-12-08	ATH	EE938375BED05C20	15592450	Windows 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2020-01-10	-anonymous-	NF	no factor TF: 73-74
2019-06-14	LaurV	NF	no factor TF: 72-73
2016-12-08	ATH	C-LL	EE938375BED05C20
2016-12-02	George Woltman	C-LL	EE938375BED05C20
2015-08-28	AirSquirrels	NF	no factor TF: 71-72
2015-01-14	kracker	NF	no factor TF: 70-71
2015-01-14	Mark Rose	NF	no factor TF: 69-70
2014-02-11	LaurV	NF	no factor TF: 68-69
2009-03-23	davy	C-LL	0C1D644E021E71F9
2009-03-05	davy	NF-PM1	B1=500000, B2=14875000, E=6
2007-03-20	dlsilver	NF	no factor TF: 1-68