1 021 441 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
2352493154439825239	19	61.0	2009-03-18 15:48:02

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
Verified (Factored)		David Slowinski	125C	0
Verified (Factored)		Florian Herzig	A1FFCC82F38D725C	0
Verified (Factored)	2002-01-22	S57483	A1FFCC82F38D725C	251095

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-01	Kriesel	E40169E44F1730D6	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-28	Oliver Kruse	50A279862E76D82B	1	0	1	3
Verified	2017-10-15	Oliver Kruse	50A279862E76D82B	1	84325	1	3
Verified	2017-12-28	ATH	50A279862E76D82B	1	239220	1	3

History

Date	User	Type	Result
2025-09-01	JEchanobe	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	E40169E44F1730D6 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2022-03-07	LordJulius	NF	no factor from 2^58 to 2^60
2021-07-03	ViliamF	NF-PM1	B1=10000000, B2=1110000000
2017-12-28	ATH	C-PRP	M1021441/2352493154439825239 : 50A279862E76D82B PRP: Verified PRP without proof (not generated)
2017-10-15	Oliver Kruse	C-PRP	M1021441/2352493154439825239 : 50A279862E76D82B PRP: Verified PRP without proof (not generated)
2017-09-28	Oliver Kruse	C-PRP	M1021441/2352493154439825239 : 50A279862E76D82B PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=300000, B2=10000000, E=12
2009-03-18	Sturle Sunde	F-ECM	Factor: 2352493154439825239
2009-02-14	Sturle Sunde	NF	no factor from 2^60 to 2^61