55 861 261 Exponent Status

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁴

TF target 2⁷³

P-1

B1 =	665000
B2 =	19950000

Status	Date	User	Residue	Shift	Software
Bad	2015-05-10	Snyke7	B47339B2419BA191	35488679	Windows 64-bit,Prime95,v25.11,build 2
Verified	2018-03-16	endless_mike	78867AE6CB212108	55216067	Linux 64-bit,Prime95,v29.4,build 7
Verified	2018-03-27	kkmrkkblmbrbk	78867AE6CB212108	27742614	Linux 64-bit,Prime95,v29.4,build 7

History

Date	User	Type	Result
2018-03-27	kkmrkkblmbrbk	C-LL	78867AE6CB212108
2018-03-16	endless_mike	C-LL	78867AE6CB212108
2015-05-10	Snyke7	C-LL	B47339B2419BA191
2014-09-06	LaurV	NF	no factor TF: 73-74
2014-07-03	chalsall	NF	no factor TF: 72-73
2011-09-21	kdgehman	NF-PM1	B1=665000, B2=19950000, E=6
2011-08-10	kdgehman	NF	no factor TF: 71-72
2011-08-10	kdgehman	NF	no factor TF: 70-71
2011-03-23	kdgehman	NF	no factor TF: 69-70
2011-03-23	kdgehman	NF	no factor TF: 68-69
2009-07-20	Choi4KANG	NF	no factor TF: 67-68
2009-03-16	dlerick66	NF	no factor TF: 66-67
2009-03-15	dlerick66	NF	no factor TF: 65-66
2009-03-14	dlerick66	NF	no factor TF: 64-65
2008-12-01	1997rj7	NF	no factor TF: 1-64
2002-08-17	-anonymous-	NF	no factor TF: 1-58
2001-09-22	-anonymous-	NF	no factor TF: 1-57
2000-06-11	-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

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