42 576 463 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 2⁷³

TF target 2⁷²

P-1

B1 =	480000
B2 =	11640000

Status	Date	User	Residue	Shift	Software
Verified	2012-04-13	CaptainEntropy	089BC240B933F33D	26406253	Windows,Prime95,v26.5,build 5
Verified	2012-04-21	Dubslow	089BC240B933F33D	14376392	Windows 64-bit,Prime95,v27.4,build 1

History

Date	User	Type	Result
2020-05-10	Sid & Andy	NF	no factor TF: 72-73
2012-04-21	Dubslow	C-LL	089BC240B933F33D
2012-04-13	CaptainEntropy	C-LL	089BC240B933F33D
2012-03-16	CaptainEntropy	NF-PM1	B1=480000, B2=11640000
2012-03-02	Dubslow	NF	no factor TF: 69-72
2011-09-07	CaptainEntropy	NF	no factor TF: 68-69
2008-11-19	CaptainEntropy	NF-PM1	B1=245000, B2=5451250
2007-06-15	GrunwalderGIMP	NF	no factor TF: 1-68