39 478 379 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 =	485000
B2 =	9215000

Status	Date	User	Residue	Shift	Software
Verified	2007-09-13	Karl-Heinz Kuhl	895DB21C0218F2D7	3563124	Windows,Prime95,v24 final,(aka Wc1)
Verified	2017-03-02	Dubslow	895DB21C0218F2D7	23679540	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2020-03-13	Architects Cubed	NF-PM1	B1=485000, B2=9215000, E=12
2020-01-31	-anonymous-	NF	no factor TF: 73-74
2019-10-13	-anonymous-	NF	no factor TF: 72-73
2019-07-17	monst	NF	no factor TF: 71-72
2017-03-02	Dubslow	C-LL	895DB21C0218F2D7
2014-12-10	NickOfTime	NF	no factor TF: 70-71
2014-12-06	Mark Rose	NF	no factor TF: 69-70
2007-09-13	mskuhl	C-LL	895DB21C0218F2D7
2007-08-14	mskuhl	NF-PM1	B1=585000
2007-03-04	Per Jessen	NF	no factor TF: 1-69
2003-09-29	-anonymous-	NF	no factor TF: 1-60
2003-09-21	-anonymous-	NF	no factor TF: 1-59
2001-02-25	Joss	NF	no factor TF: 1-56