1 235 021 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷¹

TF target 2⁶⁰

TF below 2^81 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	200000000
B2 =	2000382605760

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Marlene Menard	33C3E421C906C984	0
Verified		David Tegerdine	33C3E421C906C984	0
Verified		Cornelius Caesar	33C3E421C906C984	0
Verified	2015-11-12	MadPoo	33C3E421C906C984	409377
Verified	2023-05-05	Sergey Nosov	33C3E421C906C984	798146

History

Date	User	Type	Result
2023-05-05	Sergey Nosov	C-LL	33C3E421C906C984
2023-02-02	kracker	NF-PM1	B1=200000000, B2=2000382605760
2020-10-24	kracker	NF-PM1	B1=54404301, B2=2448193545, E=12
2020-10-21	kracker	NF-PM1	B1=54404301, B2=2448193545, E=12
2018-10-13	Joss	NF-PM1	B1=1235021, B2=135852310, E=12
2018-05-01	Joss	NF-PM1	B1=1235021, B2=123502100, E=12
2016-08-27	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-08-03	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-11-12	MadPoo	C-LL	33C3E421C906C984
2014-04-01	Never Odd Or Even	NF	no factor from 2^70 to 2^71
2014-02-04	Never Odd Or Even	NF	no factor from 2^69 to 2^70
2014-02-04	Never Odd Or Even	NF	no factor from 2^68 to 2^69
2014-02-04	Never Odd Or Even	NF	no factor from 2^67 to 2^68
2014-02-04	Never Odd Or Even	NF	no factor from 2^66 to 2^67
2014-02-04	Never Odd Or Even	NF	no factor from 2^65 to 2^66
2013-11-10	David Campeau	NF-PM1	B1=1740000, B2=48720000, E=12
2013-04-09	ramgeis	NF	no factor from 2^64 to 2^65
2013-04-09	ramgeis	NF	no factor from 2^63 to 2^64
2012-10-26	dbaugh	NF	no factor from 2^62 to 2^63
2011-05-09	megavink	NF	no factor from 2^61 to 2^62
2009-02-18	Sturle Sunde	NF	no factor from 2^60 to 2^61

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