2 375 221 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁰

TF target 2⁶³

TF below 2^80 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	14300000
B2 =	36723209250

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	74 / 640

Estimated T-Level: 25.6 ⓘ

Status	Date	User	Residue	Shift
Verified		Frank Byrum	B4D7919AC134AEC9	0
Verified	1999-04-02	Michael Donan	B4D7919AC134AEC9	989209
Verified	2018-05-14	kkmrkkblmbrbk	B4D7919AC134AEC9	529718

History

Date	User	Type	Result
2024-04-12	TJAOI	NF	no factor from 2^69 to 2^70
2023-10-09	Sid & Andy	NF-PM1	B1=14300000, B2=36723209250
2023-09-25	Joss	NF-PM1	B1=1000000, B2=8032923360
2023-07-15	Joss	NF-PM1	B1=1000000, B2=3799936140
2023-03-21	Joss	NF-PM1	B1=1000000, B2=1647746100
2023-01-25	Joss	NF-PM1	B1=1000000, B2=571651080
2021-06-10	TJAOI	NF	no factor from 2^68 to 2^69
2019-04-01	TJAOI	NF	no factor from 2^67 to 2^68
2018-05-14	kkmrkkblmbrbk	C-LL	B4D7919AC134AEC9
2017-07-29	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-10-31	ramgeis	NF	no factor from 2^65 to 2^66
2015-09-30	mikr	NF-PM1	B1=3000000, B2=100000000, E=12
2015-03-09	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-09	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-10	Joss	NF-PM1	B1=127022
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-31	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-12-29	markr	NF-PM1	B1=100000, B2=2025000, E=6
2010-11-15	Joss	NF-PM1	B1=20000
2010-11-07	Joss	NF-PM1	B1=15000
2009-01-14	Sturle Sunde	NF	no factor from 2^60 to 2^61

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