1 918 439 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
266570770942247	15	47.9	old
1290688414780282567632559	25	80.1	2021-01-20 07:31:03

ECM

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

Estimated T-Level: 25.8 ⓘ

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

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	D813BA152F01231B	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-04	Oliver Kruse	E30CFC8EB0A49CF6	1	0	1	3
Verified (Factored)	2017-11-10	kkmrkkblmbrbk	E30CFC8EB0A49CF6	1	509501	1	3
Verified	2021-01-20	MarkS	D813BA152F01231B	2	1355961	5	3
Verified	2021-01-20	MarkS	D813BA152F01231B	2	167964	5	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	D813BA152F01231B PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2021-01-21	curtisc	CERT	PRP Certification Proof certified good
2021-01-20	MarkS	C-PRP	M1918439/266570770942247/1290688414780282567632559 : D813BA152F01231B PRP proof power = 7 PRP: Verified Proof certified good
2021-01-20	C.D.B.	CERT	PRP Certification Proof certified good
2021-01-20	MarkS	C-PRP	M1918439/266570770942247/1290688414780282567632559 : D813BA152F01231B PRP proof power = 7 PRP: Verified Proof certified good
2021-01-20	seatsea	F-ECM	Factor: 1290688414780282567632559 / (ECM curve 2, B1=50000, B2=6050000, Sigma=5376398277213099)
2017-11-10	kkmrkkblmbrbk	C-PRP	M1918439/266570770942247 : E30CFC8EB0A49CF6 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1918439/266570770942247 : E30CFC8EB0A49CF6 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12