61 352 381 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 2⁷⁴

P-1

B1 =	580000
B2 =	11600000

Status	Date	User	Residue	Shift	Software
Verified	2014-06-02	Kyle Z Schmidt	3A0B012DD4855F3E	20982913	Windows 64-bit,Prime95,v27.9,build 1
Verified	2021-08-16	jpollicove	3A0B012DD4855F3E	44754981	Mac OS X 64-bit,Prime95,v29.8,build 7

History

Date	User	Type	Result
2021-08-16	jpollicove	C-LL	3A0B012DD4855F3E
2014-06-02	Kyle Z Schmidt	C-LL	3A0B012DD4855F3E
2014-05-13	Chuck	NF	no factor TF: 73-74
2013-04-16	Nesowa	NF-PM1	B1=580000, B2=11600000, E=6
2013-01-21	Jerry Hallett	NF	no factor TF: 71-73
2013-01-15	lycorn	NF	no factor TF: 70-71
2009-03-24	ANONYMOUS	NF	no factor TF: 1-70
2009-03-17	ANONYMOUS	NF	no factor TF: 1-70
2009-02-01	Gnorfe	NF	no factor TF: 63-64
2004-04-09	-anonymous-	NF	no factor TF: 1-62
2003-10-23	Gordon Spence	NF	no factor TF: 1-60
2003-06-17	Gordon Spence	NF	no factor TF: 1-59