1 028 047 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
236630935137852840479	21	67.7	2009-10-18 16:26:54

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	1666	0
Verified (Factored)		Brian Reilly	1E6FF95BF452D666	0
Verified (Factored)	2002-02-03	S57483	1E6FF95BF452D666	742113

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-01	Kriesel	B4F09A0CBDD853DD	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-28	Oliver Kruse	1EB9E93B77507984	1	0	1	3
Verified	2017-10-18	kkmrkkblmbrbk	1EB9E93B77507984	1	73602	1	3

History

Date	User	Type	Result
2025-09-01	William Weaver	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	B4F09A0CBDD853DD PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2022-03-07	LordJulius	NF	no factor from 2^58 to 2^60
2021-07-13	ViliamF	NF-PM1	B1=10000000, B2=1110000000
2017-10-18	kkmrkkblmbrbk	C-PRP	M1028047/236630935137852840479 : 1EB9E93B77507984 PRP: Verified PRP without proof (not generated)
2017-09-28	Oliver Kruse	C-PRP	M1028047/236630935137852840479 : 1EB9E93B77507984 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=300000, B2=10000000, E=12
2009-10-18	SubPrime	F-ECM	Factor: 236630935137852840479
2009-02-15	Sturle Sunde	NF	no factor from 2^60 to 2^61