55 658 921 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 2⁷³

P-1

B1 =	550000
B2 =	11550000

Status	Date	User	Residue	Shift	Software
Verified	2013-08-13	Kyle Z Schmidt	81A3915EF52FD1EC	41853159	Windows 64-bit,Prime95,v27.9,build 1
Verified	2019-09-06	-anonymous-	81A3915EF52FD1EC	5703501	Windows 64-bit,Prime95,v29.4,build 8

History

Date	User	Type	Result
2019-09-06	-anonymous-	C-LL	81A3915EF52FD1EC
2019-04-21	Chuck	NF	no factor TF: 73-74
2016-02-12	-anonymous-	NF	no factor TF: 72-73
2013-08-13	Kyle Z Schmidt	C-LL	81A3915EF52FD1EC
2012-08-04	Chuck	NF-PM1	B1=550000, B2=11550000, E=6
2012-04-28	megavink	NF	no factor TF: 71-72
2012-04-28	megavink	NF	no factor TF: 70-71
2011-06-05	ITS	NF	no factor TF: 69-70
2011-04-08	greensinoz	NF	no factor TF: 68-69
2010-04-19	BranMuffin	NF	no factor TF: 67-68
2010-04-13	Sturle Sunde	NF	no factor TF: 66-67
2010-04-12	Superbob	NF	no factor TF: 65-66
2010-03-30	garo	NF	no factor TF: 64-65
2008-09-01	-anonymous-	NF	no factor TF: 1-64
2001-09-30	-anonymous-	NF	no factor TF: 1-57
2000-05-31	-anonymous-	NF	no factor TF: 1-56
2000-03-01	-anonymous-	NF	no factor TF: 1-54
2000-01-19	-anonymous-	NF	no factor TF: 1-53
1999-12-15	-anonymous-	NF	no factor TF: 1-53