1 751 467 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 =	232267155120

ECM

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

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Al Patunoff	005667E833300FBE	0
Verified	1998-12-06	Ethan O'Connor	005667E833300FBE	348478
Verified	2015-07-18	MadPoo	005667E833300FBE	512242

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	359533983C9D7024	0	1	3

History

Date	User	Type	Result
2025-09-03	johnguin	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	359533983C9D7024 PRP proof power = 6 PRP: Verified Proof certified good
2023-07-21	linament	NF-PM1	B1=20000000, B2=232267155120
2023-07-20	linament	NF-PM1	B1=17000000
2023-06-01	Joss	NF-PM1	B1=1751467, B2=8136120720
2023-01-04	Joss	NF-PM1	B1=1751467, B2=1459146150
2023-01-04	Joss	NF-PM1	B1=1751467, B2=825903540
2019-08-06	TJAOI	NF	no factor from 2^67 to 2^68
2018-10-19	Joss	NF-PM1	B1=1751467, B2=192661370, E=12
2018-09-14	Joss	NF-PM1	B1=1751467, B2=175146700, E=12
2018-06-18	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
2015-09-05	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-18	MadPoo	C-LL	005667E833300FBE
2015-05-13	snme2pm1	NF	no factor from 2^64 to 2^65
2015-05-13	snme2pm1	NF	no factor from 2^63 to 2^64
2015-04-24	mikr	NF-PM1	B1=2475400, B2=86660000, E=12
2014-09-16	-Anonymous-	NF-PM1	B1=173292
2014-05-06	Joss	NF-PM1	B1=136646
2014-04-08	Joss	NF-PM1	B1=100000
2011-02-08	Carsten Kossendey	NF-PM1	B1=95000, B2=1567500, E=6
2010-12-13	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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