1 091 243 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
9075021226433	13	43.0	old
1525719387964381999	19	60.4	2016-02-04 13:29:27

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 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)	2025-09-01	Kriesel	41C1CCD9F064BC62	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-29	Oliver Kruse	991E027FE7E0735B	2	0	1	3
Verified	2017-10-18	kkmrkkblmbrbk	991E027FE7E0735B	2	936482	1	3

History

Date	User	Type	Result
2025-09-02	Francisco Corrales Morales	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	41C1CCD9F064BC62 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2024-10-05	timc995	NF-PM1	B1=2000000, B2=63812698950
2017-10-18	kkmrkkblmbrbk	C-PRP	M1091243/9075021226433/1525719387964381999 : 991E027FE7E0735B PRP: Verified PRP without proof (not generated)
2017-09-29	Oliver Kruse	C-PRP	M1091243/9075021226433/1525719387964381999 : 991E027FE7E0735B PRP: Verified PRP without proof (not generated)
2016-02-04	TJAOI	F	Factor: 1525719387964381999 / TF: 60-61