38 481 449 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 =	425000
B2 =	6800000

Status	Date	User	Residue	Shift	Software
Verified	2008-03-05	Keith Swan	FCB6E21D8339E1D8	2574040	Windows,Prime95,v24 final,(aka Wc1)
Verified	2017-01-23	Dubslow	FCB6E21D8339E1D8	37547816	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2024-05-27	LaurV	NF	no factor TF: 68-69
2019-06-02	Sid & Andy	NF	no factor TF: 72-73
2019-04-11	monst	NF	no factor TF: 71-72
2017-01-23	Dubslow	C-LL	FCB6E21D8339E1D8
2014-12-16	chalsall	NF	no factor TF: 70-71
2014-11-25	Andrew B	NF	no factor TF: 69-70
2013-09-19	Carsten Kossendey	NF	no factor TF: 68-69
2008-03-03	-anonymous-	C-LL	FCB6E21D8339E1D8
2008-01-15	-anonymous-	NF-PM1	B1=425000, B2=6800000
2006-07-10	JC_Herles	NF	no factor TF: 1-68
2003-09-14	-anonymous-	NF	no factor TF: 1-59
2003-09-14	-anonymous-	NF	no factor TF: 1-60