1 075 897 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
25821529	8	24.6	old
923754982975930031	18	59.7	2015-12-07 12:51:01

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	659F6372F92013A8	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-28	Oliver Kruse	E861186C68F916F6	2	0	1	3
Verified	2017-10-16	Oliver Kruse	E861186C68F916F6	2	601091	1	3
Verified	2018-01-01	ATH	E861186C68F916F6	2	42388	1	3

History

Date	User	Type	Result
2025-09-01	LOBES	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	659F6372F92013A8 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2024-08-22	cramsey87	NF-PM1	B1=3000000, B2=22221719520
2018-01-01	ATH	C-PRP	M1075897/25821529/923754982975930031 : E861186C68F916F6 PRP: Verified PRP without proof (not generated)
2017-10-16	Oliver Kruse	C-PRP	M1075897/25821529/923754982975930031 : E861186C68F916F6 PRP: Verified PRP without proof (not generated)
2017-09-28	Oliver Kruse	C-PRP	M1075897/25821529/923754982975930031 : E861186C68F916F6 PRP: Verified PRP without proof (not generated)
2015-12-07	TJAOI	F	Factor: 923754982975930031 / TF: 59-60