1 550 467 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
462039167	9	28.8	old
46766851302092497	17	55.4	2015-01-21 12:38:32

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 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	092967476DEA9999	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-01	Oliver Kruse	7242785D4244536A	2	0	1	3
Verified	2017-10-30	kkmrkkblmbrbk	7242785D4244536A	2	75272	1	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	092967476DEA9999 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-10-30	kkmrkkblmbrbk	C-PRP	M1550467/462039167/46766851302092497 : 7242785D4244536A PRP: Verified PRP without proof (not generated)
2017-10-01	Oliver Kruse	C-PRP	M1550467/462039167/46766851302092497 : 7242785D4244536A PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2015-01-21	TJAOI	F	Factor: 46766851302092497 / TF: 55-56