38 418 769 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 =	400000
B2 =	12000000

Status	Date	User	Residue	Shift	Software
Bad	2007-07-24	charles e. haynes	F3668CC261E8637E	1999286	Windows,Prime95,v24 final,(aka Wc1)
Verified	2017-01-01	Dubslow	3E26317F5E2B0D68	8927445	Linux 64-bit,Prime95,v28.7,build 1
Verified	2017-01-03	Remi Lucet	3E26317F5E2B0D68	12468624	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2024-05-21	James Heinrich	NF	no factor TF: 68-69
2022-06-19	Sid & Andy	NF	no factor TF: 72-73
2019-03-03	monst	NF	no factor TF: 71-72
2017-01-03	Remi Lucet	C-LL	3E26317F5E2B0D68
2017-01-01	Dubslow	C-LL	3E26317F5E2B0D68
2016-05-12	HBendtz	NF-PM1	B1=400000, B2=12000000, E=12
2014-12-08	VictordeHollander	NF	no factor TF: 70-71
2014-11-23	Mark Rose	NF	no factor TF: 69-70
2012-10-15	Carsten Kossendey	NF	no factor TF: 68-69
2007-07-24	id_warrior	C-LL	F3668CC261E8637E
2007-05-12	id_warrior	NF-PM1	B1=615000
2006-07-10	-anonymous-	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