1 125 811 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
577713143487073264303	21	69.0	2015-01-20 18:46:17

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)		Simon Burge	A95A43B0F687FDA5	0
Verified (Factored)		Cornelius Caesar	A95A43B0F687FDA5	0
Verified (Factored)		Ricardo Montiel	A95A43B0F687FDA5	0
Bad		Rob Hooft	2952F249ADBC0A23	0

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-01	Kriesel	4FF6CF97987B37A0	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-29	Oliver Kruse	1E58DD1E46B67C69	1	0	1	3
Verified	2017-10-16	Oliver Kruse	1E58DD1E46B67C69	1	1111391	1	3
Verified	2018-01-03	ATH	1E58DD1E46B67C69	1	670967	1	3

History

Date	User	Type	Result
2025-09-02	ANONYMOUS	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	4FF6CF97987B37A0 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2022-03-07	LordJulius	NF	no factor from 2^58 to 2^60
2018-01-03	ATH	C-PRP	M1125811/577713143487073264303 : 1E58DD1E46B67C69 PRP: Verified PRP without proof (not generated)
2017-10-16	Oliver Kruse	C-PRP	M1125811/577713143487073264303 : 1E58DD1E46B67C69 PRP: Verified PRP without proof (not generated)
2017-09-29	Oliver Kruse	C-PRP	M1125811/577713143487073264303 : 1E58DD1E46B67C69 PRP: Verified PRP without proof (not generated)
2015-01-20	ronkajitsu	F-ECM	Factor: 577713143487073264303 / (ECM curve 2, B1=50000, B2=5000000)
2015-01-19	lycorn	NF	no factor from 2^64 to 2^65
2014-12-23	Matthias Wurtinger	NF	no factor from 2^63 to 2^64
2013-10-07	David Campeau	NF-PM1	B1=3660000, B2=131760000, E=12
2013-09-29	David Campeau	NF-PM1	B1=1225000, B2=35525000, E=12
2012-10-18	dbaugh	NF	no factor from 2^62 to 2^63
2011-10-18	c10ck3r	NF	no factor from 2^61 to 2^62
2009-02-14	Sturle Sunde	NF	no factor from 2^60 to 2^61