1 140 983 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

No factors below 2⁶⁹

TF target 2⁶⁰

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

P-1

B1 =	12000000
B2 =	88140272220

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	154C	0
Verified		knut ploder	5DD7F2E690C0D54C	0
Verified	2012-08-14	ATH	5DD7F2E690C0D54C	201535
Verified	2016-06-01	MadPoo	5DD7F2E690C0D54C	13376

Status	Date	User	Residue	Shift	Type	Base
Verified	2020-11-05	Ethan O'Connor	9786EC463F11BB03	1137228	1	3
Verified	2025-09-01	Kriesel	9786EC463F11BB03	0	1	3

History

Date	User	Type	Result
2025-09-02	pilot no more	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	9786EC463F11BB03 PRP proof power = 6 PRP: Verified Proof certified good
2022-05-24	mikr	NF-PM1	B1=12000000, B2=88140272220
2021-07-25	MadPoo	NF	no factor from 2^68 to 2^69
2020-11-11	Ben Delo	CERT	PRP Certification CERT proof power = 6 Proof certified good
2020-11-05	Ethan O'Connor	C-PRP	9786EC463F11BB03 PRP proof power = 6 PRP: Verified Proof certified good
2018-11-13	Joss	NF-PM1	B1=1140983, B2=136917960, E=12
2018-07-06	ramgeis	NF	no factor from 2^67 to 2^68
2018-04-13	Joss	NF-PM1	B1=1140983, B2=114098300, E=12
2017-02-15	Smok_bmv	NF	no factor from 2^66 to 2^67
2016-07-27	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-07-25	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-06-01	MadPoo	C-LL	5DD7F2E690C0D54C
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-07-10	omylist	NF	no factor from 2^65 to 2^66
2015-01-13	lycorn	NF	no factor from 2^64 to 2^65
2014-12-26	Matthias Wurtinger	NF	no factor from 2^63 to 2^64
2013-10-01	David Campeau	NF-PM1	B1=1220000, B2=35380000, E=12
2012-10-21	dbaugh	NF	no factor from 2^62 to 2^63
2012-08-27	Axelsson	NF	no factor from 2^61 to 2^62
2012-08-14	ATH	C-LL	5DD7F2E690C0D54C
2009-02-16	Sturle Sunde	NF	no factor from 2^60 to 2^61

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