81 245 897 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 2⁷⁵

P-1

B1 =	690000
B2 =	14145000

Status	Date	User	Residue	Shift	Software
Bad	2017-10-08	Jake	B7A4C72DB672B690	44207861	Windows 64-bit,Prime95,v28.10,build 1
Verified	2018-10-03	ATH	9A0B08F4AB5713E7	40626247	CUDALucas v2.06beta
Verified	2019-04-22	endless_mike	9A0B08F4AB5713E7	26680673	Linux 64-bit,Prime95,v29.4,build 8

History

Date	User	Type	Result
2019-04-22	endless_mike	C-LL	9A0B08F4AB5713E7
2018-10-03	ATH	C-LL	9A0B08F4AB5713E7
2017-10-08	Jake	C-LL	B7A4C72DB672B690
2017-05-27	Filen	NF-PM1	B1=690000, B2=14145000, E=12
2016-11-12	-anonymous-	NF	no factor TF: 74-75
2016-11-11	-anonymous-	NF	no factor TF: 73-74
2016-09-13	Judge Hale	NF	no factor TF: 72-73
2016-09-13	Judge Hale	NF	no factor TF: 71-72
2013-06-10	-anonymous-	NF	no factor TF: 70-71
2013-02-18	-anonymous-	NF	no factor TF: 69-70
2013-02-06	-anonymous-	NF	no factor TF: 68-69
2013-01-30	-anonymous-	NF	no factor TF: 67-68
2013-01-27	Cow_tipping	NF	no factor TF: 66-67
2012-08-29	Carsten Kossendey	NF	no factor TF: 65-66
2010-12-12	Architects Cubed	NF	no factor TF: 64-65