1 740 439 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with both PRP and Lucas-Lehmer tests

No factors below 2⁶⁸

TF target 2⁶¹

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

P-1

B1 =	20000000
B2 =	296735739300

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Mike Coleman	F0ED017E7F33EF70	0
Verified	1998-11-28	Gordon M. Spence	F0ED017E7F33EF70	1590543
Verified	2015-07-18	MadPoo	F0ED017E7F33EF70	453150

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	AC474B69A4E86C73	0	1	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	AC474B69A4E86C73 PRP proof power = 6 PRP: Verified Proof certified good
2023-07-24	linament	NF-PM1	B1=20000000, B2=296735739300
2023-07-23	linament	NF-PM1	B1=17000000
2023-05-08	Joss	NF-PM1	B1=1740439, B2=6159092940
2023-03-10	Joss	NF-PM1	B1=1740439, B2=2749006260
2023-01-04	Joss	NF-PM1	B1=1740439, B2=1043962920
2022-08-01	masser	NF-PP1	Start=74/59, B1=1700000, B2=61200000
2019-07-31	TJAOI	NF	no factor from 2^67 to 2^68
2018-10-18	Joss	NF-PM1	B1=1740439, B2=191448290, E=12
2018-08-06	Joss	NF-PM1	B1=1740439, B2=174043900, E=12
2018-01-29	TJAOI	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-09-04	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-18	MadPoo	C-LL	F0ED017E7F33EF70
2015-05-12	snme2pm1	NF	no factor from 2^64 to 2^65
2015-05-12	snme2pm1	NF	no factor from 2^63 to 2^64
2015-04-12	mikr	NF-PM1	B1=2475400, B2=86660000, E=12
2014-12-02	Joss	NF-PM1	B1=210634
2014-09-11	Joss	NF-PM1	B1=173756
2014-05-06	Joss	NF-PM1	B1=136878
2014-04-05	Joss	NF-PM1	B1=100000
2011-02-11	Carsten Kossendey	NF-PM1	B1=95000, B2=1543750, E=6
2010-11-18	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-19	Architects Cubed	NF	no factor from 2^60 to 2^61

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