56 203 597 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 =	585000
B2 =	12138750

Status	Date	User	Residue	Shift	Software
Verified	2015-01-16	electron1897	C8978B4A9FDCB17E	39975858	Windows 64-bit,Prime95,v28.5,build 2
Verified	2021-05-15	Dubslow	C8978B4A9FDCB17E	27911217	Linux 64-bit,Prime95,v29.8,build 6

History

Date	User	Type	Result
2021-05-15	Dubslow	C-LL	C8978B4A9FDCB17E
2016-02-23	Mark Rose	NF	no factor TF: 60-63
2015-01-16	electron1897	C-LL	C8978B4A9FDCB17E
2014-09-04	Craig Meyers	NF	no factor TF: 73-74
2014-02-22	Axelsson	NF	no factor TF: 72-73
2012-05-06	bcp19	NF	no factor TF: 71-72
2012-05-02	josibo	NF-PM1	B1=585000, B2=12138750
2011-12-04	Tom Duell	NF	no factor TF: 70-71
2011-06-05	HighPriceRanch	NF	no factor TF: 69-70
2011-04-23	douglassm	NF	no factor TF: 68-69
2009-11-17	GrunwalderGIMP	NF	no factor TF: 67-68
2008-07-08	Sturle Sunde	NF	no factor TF: 66-67
2008-07-07	Sturle Sunde	NF	no factor TF: 65-66
2008-07-07	Sturle Sunde	NF	no factor TF: 64-65
2008-07-06	Sturle Sunde	NF	no factor TF: 63-64
2004-10-03	1997rj7	NF	no factor TF: 1-60
2002-09-14	-anonymous-	NF	no factor TF: 1-58
2001-09-22	-anonymous-	NF	no factor TF: 1-57
2000-05-31	-anonymous-	NF	no factor TF: 1-56
2000-03-08	-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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