1 575 131 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
3150263	7	21.6	old
7447126455615104292022327	25	82.6	2019-08-19 13:19:31

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 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	2EC7A209862F4EDA	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-01	Oliver Kruse	FFBDFE47370ABC6D	1	0	1	3
Verified (Factored)	2017-10-31	kkmrkkblmbrbk	FFBDFE47370ABC6D	1	1364185	1	3
Verified	2019-08-20	trebor	2EC7A209862F4EDA	2	1132664	5	3
Verified	2019-08-20	ATH	2EC7A209862F4EDA	2	679772	5	3

History

Date	User	Type	Result
2025-09-03	Emilijus	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	2EC7A209862F4EDA PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2019-08-20	ATH	C-PRP	M1575131/3150263/7447126455615104292022327 : 2EC7A209862F4EDA PRP: Verified PRP without proof (not generated)
2019-08-20	trebor	C-PRP	M1575131/3150263/7447126455615104292022327 : 2EC7A209862F4EDA PRP: Verified PRP without proof (not generated)
2019-08-19	TJAOI	F-ECM	Factor: 7447126455615104292022327 / (ECM curve 187, B1=50000, B2=5000000)
2017-10-31	kkmrkkblmbrbk	C-PRP	M1575131/3150263 : FFBDFE47370ABC6D PRP: Verified PRP without proof (not generated)
2017-10-01	Oliver Kruse	C-PRP	M1575131/3150263 : FFBDFE47370ABC6D PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12