61 131 857 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 =	12035000

Status	Date	User	Residue	Shift	Software
Verified	2014-03-27	Kyle Z Schmidt	2CE7454462A31ED7	876427	Windows 64-bit,Prime95,v27.9,build 1
Verified	2022-03-17	ANONYMOUS	2CE7454462A31ED7	3859145	Mac OS X 64-bit,Prime95,v29.8,build 6

History

Date	User	Type	Result
2022-03-17	ANONYMOUS	C-LL	2CE7454462A31ED7
2016-02-23	Mark Rose	NF	no factor TF: 62-63
2014-03-27	Kyle Z Schmidt	C-LL	2CE7454462A31ED7
2013-07-03	Kevin Jaget	NF	no factor TF: 73-74
2013-04-14	TheJudger	NF-PM1	B1=580000, B2=12035000, E=12
2012-05-11	Craig Meyers	NF	no factor TF: 69-73
2009-09-08	Sturle Sunde	NF	no factor TF: 68-69
2009-04-05	Freightyard	NF	no factor TF: 67-68
2009-04-04	Freightyard	NF	no factor TF: 66-67
2009-04-02	Freightyard	NF	no factor TF: 65-66
2009-04-01	Freightyard	NF	no factor TF: 64-65
2009-03-31	JMGarcia	NF	no factor TF: 63-64
2004-04-09	-anonymous-	NF	no factor TF: 1-62
2003-10-08	Gordon Spence	NF	no factor TF: 1-60
2003-06-09	Gordon Spence	NF	no factor TF: 1-59