4 391 671 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
25325774339157463817	20	64.5	2010-01-01 11:22:00

ECM

Digits	B1	Curves
25	50000	3 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David A McGough	12DEBFC69CADB505	0
Verified (Factored)	1999-11-10	Michal Sajdak	12DEBFC69CADB505	250602

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-20	kkmrkkblmbrbk	98AE067BBDDD6FD0	1	0	1	3
Verified	2018-02-08	MrSupp_CZ	98AE067BBDDD6FD0	1	1654869	1	3

History

Date	User	Type	Result
2023-03-14	USAFSS	NF-PM1	B1=224000, B2=114813270
2018-02-08	MrSupp_CZ	C-PRP	M4391671/25325774339157463817 : 98AE067BBDDD6FD0 PRP: Verified PRP without proof (not generated)
2017-09-20	kkmrkkblmbrbk	C-PRP	M4391671/25325774339157463817 : 98AE067BBDDD6FD0 PRP: Verified PRP without proof (not generated)
2010-01-01	csaba	F-ECM	Factor: 25325774339157463817
2009-08-08	Carsten Kossendey	NF-PM1	B1=25000, B2=356250