1 981 663 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
3710434094593	13	41.8	old
16186760694689096456702487763127	32	103.7	2025-07-30 10:51:45

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	C33C7AF7253ABDF0	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	0E0835051BE24961	1	0	1	3
Verified (Factored)	2017-11-15	kkmrkkblmbrbk	0E0835051BE24961	1	738911	1	3
Verified	2025-07-30	USAFSS	C33C7AF7253ABDF0	2	1515782	5	3

P-1 factors

Date	Factor	B1	B2
2025-07-30	16186760694689096456702487763127	1680000	12407405010

History

Date	User	Type	Result
2025-09-03	Kriesel	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	C33C7AF7253ABDF0 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2025-07-30	James Carlson	CERT	PRP Certification Proof certified good
2025-07-30	USAFSS	C-PRP	M1981663/3710434094593/16186760694689096456702487763127 : C33C7AF7253ABDF0 PRP proof power = 7 PRP: Verified Proof certified good
2025-07-30	USAFSS	F-PM1	Factor: 16186760694689096456702487763127 / (P-1, B1=1680000, B2=12407405010)
2022-08-13	USAFSS	NF-PM1	B1=132000, B2=134381520
2017-11-15	kkmrkkblmbrbk	C-PRP	M1981663/3710434094593 : 0E0835051BE24961 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1981663/3710434094593 : 0E0835051BE24961 PRP: Verified (Factored) PRP without proof (not generated)