38 516 521 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 =	445000
B2 =	9567500

Status	Date	User	Residue	Shift	Software
Verified	2009-08-23	Kyle Z Schmidt	02CCA9A33118CA49	36334500	Windows,Prime95,v24 final,(aka Wc1)
Verified	2015-06-30	-anonymous-	02CCA9A33118CA49	8697606	Windows,Prime95,v24 final,(aka Wc1)

History

Date	User	Type	Result
2022-06-12	Sid & Andy	NF	no factor TF: 72-73
2019-02-23	monst	NF	no factor TF: 71-72
2015-06-30	-anonymous-	C-LL	02CCA9A33118CA49
2014-12-04	Chuck	NF	no factor TF: 70-71
2014-04-16	mikr	NF	no factor TF: 69-70
2013-08-22	Le Comte	NF	no factor TF: 68-69
2009-08-23	Kyle Z Schmidt	C-LL	02CCA9A33118CA49
2009-07-24	Kyle Z Schmidt	NF-PM1	B1=445000, B2=9567500
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
2001-02-25	Joss	NF	no factor TF: 1-56