1 151 911 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

No factors below 2⁷¹

TF target 2⁶⁰

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

P-1

B1 =	12000000
B2 =	82743881220

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	1C89	0
Verified		Jack Holt	6DFFF66E1866BC89	0
Verified	2002-07-14	S57483	6DFFF66E1866BC89	416883
Verified	2016-06-01	MadPoo	6DFFF66E1866BC89	822912

Status	Date	User	Residue	Shift	Type	Base
Verified	2020-11-05	Ethan O'Connor	4BE07E82E66D64AB	1010856	1	3
Verified	2025-09-01	Kriesel	4BE07E82E66D64AB	0	1	3

History

Date	User	Type	Result
2025-09-02	juwix	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	4BE07E82E66D64AB PRP proof power = 6 PRP: Verified Proof certified good
2022-06-15	mikr	NF-PM1	B1=12000000, B2=82743881220
2020-11-11	ky0uraku	CERT	PRP Certification CERT proof power = 6 Proof certified good
2020-11-05	Ethan O'Connor	C-PRP	4BE07E82E66D64AB PRP proof power = 6 PRP: Verified Proof certified good
2018-10-12	Joss	NF-PM1	B1=1151911, B2=126710210, E=12
2018-04-17	Joss	NF-PM1	B1=1151911, B2=115191100, E=12
2018-04-17	Joss	NF-PM1	B1=1031680
2016-07-27	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-07-26	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-06-01	MadPoo	C-LL	6DFFF66E1866BC89
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2014-04-01	Never Odd Or Even	NF	no factor from 2^70 to 2^71
2014-02-22	Never Odd Or Even	NF	no factor from 2^69 to 2^70
2014-02-22	Never Odd Or Even	NF	no factor from 2^68 to 2^69
2014-02-22	Never Odd Or Even	NF	no factor from 2^67 to 2^68
2014-02-22	Never Odd Or Even	NF	no factor from 2^66 to 2^67
2014-02-22	Never Odd Or Even	NF	no factor from 2^65 to 2^66
2013-09-03	David Campeau	NF	no factor from 2^64 to 2^65
2011-10-04	Bdot	NF-PM1	B1=1500000, B2=60000000, E=12
2011-09-29	Bdot	NF	no factor from 2^61 to 2^64
2009-02-15	Sturle Sunde	NF	no factor from 2^60 to 2^61

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