1 985 441 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 3 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
743206158649	12	39.4	old
2199712297373675911	19	60.9	2016-03-16 12:49:07
41354939120054819715263	23	75.1	2022-08-14 08:15:23

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 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	2A4998446DFD7D40	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	D31F6AB5D1CC1BA2	2	0	1	3
Verified (Factored)	2017-11-12	kkmrkkblmbrbk	D31F6AB5D1CC1BA2	2	785757	1	3
Verified	2022-08-16	LordJulius	2A4998446DFD7D40	3	758198	5	3

P-1 factors

Date	Factor	B1	B2
2022-08-14	41354939120054819715263	132000	134381520

History

Date	User	Type	Result
2025-09-03	bwillard	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	2A4998446DFD7D40 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2025-08-02	USAFSS	NF-PM1	B1=1904000, B2=9622062450
2022-08-16	VikkiMtF	CERT	PRP Certification Proof certified good
2022-08-16	LordJulius	C-PRP	M1985441/743206158649/2199712297373675911/41354939120054819715263 : 2A4998446DFD7D40 PRP proof power = 7 PRP: Verified Proof certified good
2022-08-14	USAFSS	F-PM1	Factor: 41354939120054819715263 / (P-1, B1=132000, B2=134381520)
2017-11-12	kkmrkkblmbrbk	C-PRP	M1985441/743206158649/2199712297373675911 : D31F6AB5D1CC1BA2 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1985441/743206158649/2199712297373675911 : D31F6AB5D1CC1BA2 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	TJAOI	F	Factor: 2199712297373675911 / TF: 60-61