1 771 657 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
60227589632880603313	20	65.7	2011-02-02 03:56:59

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
Verified (Factored)		Kevin Postlewaite	055B2F08331FEFEC	0
Verified (Factored)	1999-01-10	Pavol Krasny	055B2F08331FEFEC	37173

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	9F795C544346FBD2	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-03	Oliver Kruse	E716BDBB5150B871	1	0	1	3
Verified	2017-11-04	kkmrkkblmbrbk	E716BDBB5150B871	1	942893	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	9F795C544346FBD2 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-11-04	kkmrkkblmbrbk	C-PRP	M1771657/60227589632880603313 : E716BDBB5150B871 PRP: Verified PRP without proof (not generated)
2017-10-03	Oliver Kruse	C-PRP	M1771657/60227589632880603313 : E716BDBB5150B871 PRP: Verified PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2011-02-02	Carsten Kossendey	F-PM1	Factor: 60227589632880603313
2010-12-13	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-20	Architects Cubed	NF	no factor from 2^60 to 2^61