28 595 843 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 2⁷⁰

P-1

B1 =	280000
B2 =	2940000

Status	Date	User	Residue	Shift	Software
Verified	2005-04-26	Aaron Zod	BEB46B147246B62D	8262515	Windows,Prime95,v23,NT service,(aka WZ5)
Verified	2011-10-04	Dubslow	BEB46B147246B62D	12175363	Windows 64-bit,Prime95,v26.6,build 3

History

Date	User	Type	Result
2021-10-06	TheJudger	NF	no factor TF: 74-75
2021-09-10	TheJudger	NF	no factor TF: 73-74
2021-08-24	TheJudger	NF	no factor TF: 72-73
2021-08-22	TheJudger	NF	no factor TF: 71-72
2021-01-20	mikr	NF	no factor TF: 70-71
2017-04-15	ramgeis	NF	no factor TF: 69-70
2015-06-29	Nesowa	NF	no factor TF: 68-69
2011-10-04	Dubslow	C-LL	BEB46B147246B62D
2005-04-26	-anonymous-	C-LL	BEB46B147246B62D
2005-04-02	-anonymous-	NF-PM1	B1=280000, B2=2940000
2005-03-06	sannerud.com	NF	no factor TF: 1-68
2001-08-24	Net_Force	NF	no factor TF: 1-56