42 433 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 2^148 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	5000000000
B2 =	500286198992580

ECM

Estimated T-Level: 46.1 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	5D56	0
Verified		George Woltman	C56727625F37DD56	0
Verified		Brian J. Beesley	C56727625F37DD56	0
Verified	2015-04-11	MadPoo	C56727625F37DD56	35671

History

Date	User	Type	Result
2023-08-06	masser	NF-PP1	Start=94/37, B1=160000000, B2=28640000000
2022-09-25	masser	NF-PP1	Start=2/7, B1=10000000, B2=480000000
2022-09-25	masser	NF-PP1	Start=6/5, B1=5000000, B2=205000000
2022-09-25	masser	NF-PP1	Start=137/41, B1=2500000, B2=72500000
2022-07-12	ATH	NF-PM1	B1=5000000000, B2=500286198992580
2021-06-06	Ruslan Borisov	NF	no factor from 2^65 to 2^66
2019-09-30	Yxinity	NF	no factor from 2^64 to 2^65
2019-09-30	Yxinity	NF	no factor from 2^64 to 2^65
2019-03-26	alex	NF-PM1	B1=1000000000, B2=50000000000, E=12
2018-06-17	Yxinity	NF	no factor from 2^63 to 2^64
2018-06-12	Yxinity	NF	no factor from 2^63 to 2^64
2016-09-24	Sid & Andy	NF	no factor from 2^62 to 2^63
2016-05-16	Joss	NF-PM1	B1=200000000, B2=3600000000, E=12
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-04-11	MadPoo	C-LL	C56727625F37DD56
2014-07-16	Sid & Andy	NF	no factor from 2^61 to 2^62
2013-11-28	LaurV	NF	no factor from 2^60 to 2^61
2012-06-16	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2012-05-15	Joss	NF-PM1	B1=59961237
2012-02-17	Joss	NF-PM1	B1=24983848
2011-07-19	Joss	NF-PM1	B1=19987079
2009-02-09	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-10	Sturle Sunde	NF	no factor from 2^58 to 2^59

Username
Password