38 419 067 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 =	440000
B2 =	8580000

Status	Date	User	Residue	Shift	Software
Verified	2007-07-04	Nick Burklund	3D2D63D82682FC5F	21970537	Windows,Prime95,v24 final,(aka Wc1)
Verified	2017-01-01	Dubslow	3D2D63D82682FC5F	24948780	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2022-06-19	Sid & Andy	NF	no factor TF: 72-73
2019-03-03	monst	NF	no factor TF: 71-72
2017-01-01	Dubslow	C-LL	3D2D63D82682FC5F
2014-12-08	VictordeHollander	NF	no factor TF: 70-71
2014-11-23	Mark Rose	NF	no factor TF: 69-70
2013-08-22	Torben K.	NF	no factor TF: 68-69
2007-07-04	Nick Burklund	C-LL	3D2D63D82682FC5F
2007-05-12	Nick Burklund	NF-PM1	B1=440000, B2=8580000
2006-07-10	Marzbug	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