19 423 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 2^184 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	1000000000000
B2 =	1402034650733706990

ECM

Estimated T-Level: 56.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	55D5	0
Verified		George Woltman	9F938B9B684C55D5	0
Verified		Brian J. Beesley	9F938B9B684C55D5	0
Verified	2015-04-11	MadPoo	9F938B9B684C55D5	15

History

Date	User	Type	Result
2024-09-25	-Anonymous-	NF-PM1	B1=1000000000000, B2=1402034650733706990
2023-08-28	masser	NF-PP1	Start=6/5, B1=390000000, B2=69810000000
2023-07-08	masser	NF-PP1	Start=77/23, B1=390000000, B2=15600000000
2022-04-28	Ruslan Borisov	NF	no factor from 2^65 to 2^66
2021-12-27	-Anonymous-	NF-PM1	B1=100000000000, B2=30234726873651300
2021-12-10	Anton Repko	NF-PM1	B1=40000000000, B2=10003119659032500
2021-12-10	Anton Repko	NF-PM1	B1=40000000000, B2=7005088442742390
2021-05-11	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2018-12-03	Anton Repko	NF	no factor from 2^64 to 2^65
2018-04-20	snme2pm1	NF	no factor from 2^63 to 2^64
2018-03-20	James Hintz	NF-PM1	B1=20202279987, B2=1515170999025, E=12
2016-04-20	Sid & Andy	NF	no factor from 2^62 to 2^63
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-07-24	snme2pm1	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	9F938B9B684C55D5
2015-04-02	Jayder	NF-PM1	B1=1172220000, B2=35360118869, E=12
2013-11-17	David Campeau	NF-PM1	B1=1172220000
2013-11-13	David Campeau	NF-PM1	B1=937775000
2013-10-30	David Campeau	NF-PM1	B1=703330000
2013-10-23	David Campeau	NF-PM1	B1=468885000
2013-10-18	David Campeau	NF-PM1	B1=234445000
2012-12-25	bcp19	NF	no factor from 2^60 to 2^61
2010-06-14	chalsall	NF	no factor from 2^59 to 2^60
2010-06-14	chalsall	NF	no factor from 2^58 to 2^59

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