42 984 763 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 2⁷⁴

TF target 2⁷²

P-1

B1 =	430000
B2 =	2257500

Status	Date	User	Residue	Shift	Software
Bad	2008-06-14	C. Cooper / S. Boone	E859226641AEF500	4916240	Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified	2015-08-13	Greg	B680474CF8125E05	15735438	Windows 64-bit,Prime95,v28.5,build 2
Verified	2016-09-25	Mark Rose	B680474CF8125E05	25166659	Linux 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2024-06-18	James Heinrich	NF	no factor TF: 69-70
2019-11-04	Sid & Andy	NF	no factor TF: 73-74
2018-12-25	-anonymous-	NF	no factor TF: 72-73
2016-09-25	Mark Rose	C-LL	B680474CF8125E05
2015-08-13	Greg	C-LL	B680474CF8125E05
2015-08-07	Sid & Andy	NF	no factor TF: 71-72
2015-05-05	Mark Rose	NF	no factor TF: 70-71
2015-05-01	Carsten Kossendey	NF	no factor TF: 69-70
2014-03-07	Torben K.	NF	no factor TF: 68-69
2008-06-13	curtisc	C-LL	E859226641AEF500
2008-05-10	curtisc	NF-PM1	B1=430000, B2=2257500
2007-07-24	JC_Herles	NF	no factor TF: 1-68