38 904 911 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 =	1030000
B2 =	22917500

Status	Date	User	Residue	Shift	Software
Bad	2007-07-24	Sova	008394CBF7E19DE2	27483818	Windows,Prime95,v24 final,NT service,(aka Wc5)
Bad	2016-01-29	ktony	1A6F6847C01FEC99	19455000	CUDALucas v2.05.1
Verified	2016-02-04	ATH	4DFB9CF9665E7266	19458543	CUDALucas v2.05.1
Verified	2016-02-11	Mark Rose	4DFB9CF9665E7266	26938428	Linux 64-bit,Prime95,v28.6,build 1

History

Date	User	Type	Result
2020-11-15	-anonymous-	NF	no factor TF: 74-75
2020-07-27	Architects Cubed	NF-PM1	B1=1030000, B2=22917500, E=12
2020-02-21	-anonymous-	NF	no factor TF: 73-74
2019-10-11	-anonymous-	NF	no factor TF: 72-73
2019-04-16	monst	NF	no factor TF: 71-72
2016-02-11	Mark Rose	C-LL	4DFB9CF9665E7266
2016-02-04	ATH	C-LL	4DFB9CF9665E7266
2016-01-29	ktony	C-LL	1A6F6847C01FEC99
2014-12-07	megavink	NF	no factor TF: 70-71
2014-12-07	megavink	NF	no factor TF: 69-70
2013-08-31	america64	NF	no factor TF: 68-69
2007-07-24	Ilya S. Sapytsky	C-LL	008394CBF7E19DE2
2007-07-04	Ilya S. Sapytsky	NF-PM1	B1=620000
2006-08-14	Sturle Sunde	NF	no factor TF: 1-68
2003-09-29	-anonymous-	NF	no factor TF: 1-60
2003-09-14	-anonymous-	NF	no factor TF: 1-59