1 942 627 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
4677242185503739257174161	25	82.0	2015-10-19 04:48:32

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 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)		Charles F. Kerchner III	06EA31BEF0ABEB78	0
Verified (Factored)	1998-12-27	Mikael Bylund	06EA31BEF0ABEB78	478880
Verified (Factored)	2015-07-12	MadPoo	06EA31BEF0ABEB78	486135

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	06AAFB36CF875C67	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	A8A80D0335CE48F6	1	0	1	3
Verified	2017-10-20	Oliver Kruse	A8A80D0335CE48F6	1	854941	1	3

History

Date	User	Type	Result
2025-09-03	Dr. Dwayne	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	06AAFB36CF875C67 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-10-20	Oliver Kruse	C-PRP	M1942627/4677242185503739257174161 : A8A80D0335CE48F6 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1942627/4677242185503739257174161 : A8A80D0335CE48F6 PRP: Verified PRP without proof (not generated)
2015-10-19	Chris Smith	F-ECM	Factor: 4677242185503739257174161 / (ECM curve 3, B1=50000, B2=5000000)
2015-10-08	Bruno Victal	NF-PM1	B1=500000, B2=15000000, E=12
2015-09-05	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-12	MadPoo	C-LL	06EA31BEF0ABEB78
2015-05-05	lycorn	NF	no factor from 2^64 to 2^65
2015-05-05	lycorn	NF	no factor from 2^63 to 2^64
2011-12-11	markr	NF-PM1	B1=275000, B2=6000000, E=12
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-01-26	S485122	NF	no factor from 2^60 to 2^61