81 390 061 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 =	13972500

Status	Date	User	Residue	Shift	Software
Bad	2017-08-27	-anonymous-	C11B140401AA2903	13121924	Windows 64-bit,Prime95,v28.9,build 2
Verified	2018-09-11	ATH	CBDDD9914FACCA4D	40695216	CUDALucas v2.06beta
Verified	2019-04-22	endless_mike	CBDDD9914FACCA4D	23811527	Linux 64-bit,Prime95,v29.4,build 8

History

Date	User	Type	Result
2019-04-22	endless_mike	C-LL	CBDDD9914FACCA4D
2018-09-11	ATH	C-LL	CBDDD9914FACCA4D
2017-08-27	-anonymous-	C-LL	C11B140401AA2903
2017-06-19	arnaud	NF-PM1	B1=690000, B2=13972500, E=6
2016-11-06	TheJudger	NF	no factor TF: 74-75
2016-11-01	RichD0	NF	no factor TF: 73-74
2016-09-23	Judge Hale	NF	no factor TF: 72-73
2016-09-23	Judge Hale	NF	no factor TF: 71-72
2011-02-21	steinrar	NF	no factor TF: 70-71
2011-02-21	steinrar	NF	no factor TF: 69-70
2011-02-21	steinrar	NF	no factor TF: 68-69
2011-02-21	steinrar	NF	no factor TF: 67-68
2011-02-21	steinrar	NF	no factor TF: 65-67
2010-12-14	Architects Cubed	NF	no factor TF: 64-65