38 480 801 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 =	390000
B2 =	3120000

Status	Date	User	Residue	Shift	Software
Verified	2007-10-17	Brad Williamson	325FC81DA6E8728C	23089213	Windows,Prime95,v24 final,(aka Wc1)
Verified	2017-01-23	Dubslow	325FC81DA6E8728C	1238416	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2019-06-02	Sid & Andy	NF	no factor TF: 72-73
2019-04-10	monst	NF	no factor TF: 71-72
2017-01-23	Dubslow	C-LL	325FC81DA6E8728C
2014-12-16	chalsall	NF	no factor TF: 70-71
2014-11-25	Mark Rose	NF	no factor TF: 69-70
2013-08-22	Torben K.	NF	no factor TF: 68-69
2007-10-17	-anonymous-	C-LL	325FC81DA6E8728C
2007-08-14	-anonymous-	NF-PM1	B1=390000, B2=3120000
2006-07-10	JC_Herles	NF	no factor TF: 1-68
2003-09-14	-anonymous-	NF	no factor TF: 1-60
2003-09-14	-anonymous-	NF	no factor TF: 1-59