1 078 331 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
1807015562831497	16	50.7	old

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	DEED2DBC41791835	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-28	Oliver Kruse	B1D2DFD372AA8C26	1	0	1	3
Verified	2017-10-16	Oliver Kruse	B1D2DFD372AA8C26	1	985055	1	3
Verified	2018-01-02	ATH	B1D2DFD372AA8C26	1	42667	1	3

History

Date	User	Type	Result
2025-09-01	Mark Filipski	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	DEED2DBC41791835 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2024-08-20	cramsey87	NF-PM1	B1=7000000, B2=44829193500
2018-01-02	ATH	C-PRP	M1078331/1807015562831497 : B1D2DFD372AA8C26 PRP: Verified PRP without proof (not generated)
2017-10-16	Oliver Kruse	C-PRP	M1078331/1807015562831497 : B1D2DFD372AA8C26 PRP: Verified PRP without proof (not generated)
2017-09-28	Oliver Kruse	C-PRP	M1078331/1807015562831497 : B1D2DFD372AA8C26 PRP: Verified PRP without proof (not generated)