48 473 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁶

TF target 2⁴⁴

TF below 2^147 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	667820434
B2 =	384635810348790

ECM

Estimated T-Level: 45.7 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	464E	0
Verified		George Woltman	2A0C941D6DC5C64E	0
Verified		Brian J. Beesley	2A0C941D6DC5C64E	0
Verified	2015-04-11	MadPoo	2A0C941D6DC5C64E	35156

History

Date	User	Type	Result
2023-08-10	masser	NF-PP1	Start=122/41, B1=140000000, B2=25060000000
2023-04-16	JacobZ	NF-PM1	B1=667820434, B2=384635810348790
2023-02-16	Joss	NF-PM1	B1=50459238, B2=1246279474440
2022-09-25	masser	NF-PP1	Start=2/7, B1=10000000, B2=490000000
2022-09-25	masser	NF-PP1	Start=6/5, B1=5000000, B2=205000000
2022-09-25	masser	NF-PP1	Start=97/13, B1=2500000, B2=82500000
2021-08-08	Ruslan Borisov	NF	no factor from 2^65 to 2^66
2019-09-02	Yxinity	NF	no factor from 2^64 to 2^65
2019-09-01	Yxinity	NF	no factor from 2^64 to 2^65
2019-04-01	alex	NF-PM1	B1=1000000000, B2=50000000000, E=12
2018-05-15	Yxinity	NF	no factor from 2^63 to 2^64
2018-05-15	Yxinity	NF	no factor from 2^63 to 2^64
2016-06-13	Sid & Andy	NF	no factor from 2^62 to 2^63
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-04-11	MadPoo	C-LL	2A0C941D6DC5C64E
2014-07-20	Sid & Andy	NF	no factor from 2^61 to 2^62
2013-11-30	LaurV	NF	no factor from 2^60 to 2^61
2012-06-27	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2012-05-29	Joss	NF-PM1	B1=50458238
2012-02-17	Joss	NF-PM1	B1=21024265
2011-07-24	Joss	NF-PM1	B1=16819412
2009-01-18	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-06	Sturle Sunde	NF	no factor from 2^58 to 2^59

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