61 178 633 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	2014-05-06	Kyle Z Schmidt	A912E7F5859662A0	52667827	Windows 64-bit,Prime95,v27.9,build 1
Verified	2022-03-18	Christoph Köhn	A912E7F5859662A0	55624588	Linux 64-bit,Prime95,v29.8,build 3

History

Date	User	Type	Result
2022-03-18	Christoph Köhn	C-LL	A912E7F5859662A0
2016-02-23	Mark Rose	NF	no factor TF: 62-63
2014-05-06	Kyle Z Schmidt	C-LL	A912E7F5859662A0
2014-01-22	Chuck	NF	no factor TF: 73-74
2013-04-21	TheJudger	NF-PM1	B1=580000, B2=12035000, E=12
2013-01-20	bcp19	NF	no factor TF: 72-73
2013-01-20	bcp19	NF	no factor TF: 71-72
2012-10-31	Houd Al-Obaidli	NF	no factor TF: 70-71
2012-04-04	ANONYMOUS	NF	no factor TF: 69-70
2009-07-29	Nathan Edington	NF	no factor TF: 68-69
2009-07-21	linded	NF	no factor TF: 67-68
2009-04-12	ckprime	NF	no factor TF: 66-67
2009-04-03	glennpat	NF	no factor TF: 65-66
2009-04-02	glennpat	NF	no factor TF: 64-65
2009-04-01	Gravious	NF	no factor TF: 63-64
2004-04-09	-anonymous-	NF	no factor TF: 1-62
2003-10-14	Gordon Spence	NF	no factor TF: 1-60
2003-06-17	Gordon Spence	NF	no factor TF: 1-59