38 928 289 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 2⁷⁵

TF target 2⁷²

P-1

B1 =	365000
B2 =	2828750

Status	Date	User	Residue	Shift	Software
Verified	2008-07-04	C. Cooper / S. Boone	0386ECE795898982	33926647	Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified	2015-11-27	Dubslow	0386ECE795898982	21965088	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2020-11-16	-anonymous-	NF	no factor TF: 74-75
2020-02-28	-anonymous-	NF	no factor TF: 73-74
2019-10-18	-anonymous-	NF	no factor TF: 72-73
2019-05-01	monst	NF	no factor TF: 71-72
2015-11-27	Dubslow	C-LL	0386ECE795898982
2014-12-07	megavink	NF	no factor TF: 70-71
2014-12-07	megavink	NF	no factor TF: 69-70
2008-07-04	curtisc	C-LL	0386ECE795898982
2008-06-02	curtisc	NF-PM1	B1=365000, B2=2828750
2006-08-25	-anonymous-	NF	no factor TF: 1-69
2003-09-29	-anonymous-	NF	no factor TF: 1-60
2003-09-14	-anonymous-	NF	no factor TF: 1-59