1 906 811 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

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

TF

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 =	18300000
B2 =	58654445850

ECM

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

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Thomas Honold	1EDE18E409B930C9	0
Verified	1998-12-21	Bruce Mitchell	1EDE18E409B930C9	1866813
Verified	2015-07-14	MadPoo	1EDE18E409B930C9	197021

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	2578AE3BC1E69F51	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	2578AE3BC1E69F51 PRP proof power = 6 PRP: Verified Proof certified good
2023-10-09	Sid & Andy	NF-PM1	B1=18300000, B2=58654445850
2023-06-21	Joss	NF-PM1	B1=1906811, B2=5395249860
2023-01-11	Joss	NF-PM1	B1=1906811, B2=1890473970
2022-08-09	masser	NF-PP1	Start=2/7, B1=1500000, B2=54000000
2019-04-26	chuenkit	NF	no factor from 2^67 to 2^68
2017-11-27	mikr	NF-PM1	B1=8000000, B2=320000000, E=12
2017-03-15	Smok_bmv	NF	no factor from 2^66 to 2^67
2015-09-01	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-14	MadPoo	C-LL	1EDE18E409B930C9
2015-05-19	monst	NF	no factor from 2^64 to 2^65
2015-05-17	omylist	NF	no factor from 2^63 to 2^64
2011-06-06	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2011-02-16	GrunwalderGIMP	NF	no factor from 2^62 to 2^63
2011-02-16	GrunwalderGIMP	NF	no factor from 2^61 to 2^62
2009-05-24	Architects Cubed	NF	no factor from 2^60 to 2^61