1 741 153 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 =	17000000
B2 =	272007836100

ECM

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

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Paul Wilson	0F40337C4BE650AD	0
Verified	1999-05-02	Brian Schroeder & Aaron Koller	0F40337C4BE650AD	620318
Verified	2015-07-18	MadPoo	0F40337C4BE650AD	1404119

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	3C980D08EF7939D7	0	1	3

History

Date	User	Type	Result
2025-09-03	AFTGOLD	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	3C980D08EF7939D7 PRP proof power = 6 PRP: Verified Proof certified good
2023-07-03	linament	NF-PM1	B1=17000000, B2=272007836100
2023-05-08	Joss	NF-PM1	B1=1741153, B2=6159153000
2023-03-10	Joss	NF-PM1	B1=1741153, B2=2749066320
2023-01-04	Joss	NF-PM1	B1=1741153, B2=1044022980
2022-08-01	masser	NF-PP1	Start=152/41, B1=1700000, B2=61200000
2019-07-31	TJAOI	NF	no factor from 2^67 to 2^68
2018-10-18	Joss	NF-PM1	B1=1741153, B2=191526830, E=12
2018-08-06	Joss	NF-PM1	B1=1741153, B2=174115300, E=12
2018-01-15	TJAOI	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
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
2015-09-04	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-18	MadPoo	C-LL	0F40337C4BE650AD
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
2015-04-13	mikr	NF-PM1	B1=2475400, B2=86660000, E=12
2014-12-02	Joss	NF-PM1	B1=210589
2014-09-11	Joss	NF-PM1	B1=173726
2014-05-06	Joss	NF-PM1	B1=136863
2014-04-05	Joss	NF-PM1	B1=100000
2011-02-02	Carsten Kossendey	NF-PM1	B1=95000, B2=1543750, E=6
2010-11-18	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-20	Architects Cubed	NF	no factor from 2^60 to 2^61

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