2 421 053 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
91657470786507365244847613528100079	35	116.1	2014-04-09 06:01:02

ECM

Digits	B1	Curves
25	50000	87 / 280

Estimated T-Level: 21.6 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		John Lloyd	5D32EFBF2F5988E7	0
Verified (Factored)	1999-08-31	Takahiro Shakushi	5D32EFBF2F5988E7	1893552

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-13	Oliver Kruse	B7792EB00739C3C8	1	1393745	5	3
Verified	2017-11-27	Chang Chia-Tche	B7792EB00739C3C8	1	2269420	5	3

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-09-17	BloodIce	factor ECM small	C1S2	0.00 %	2025-10-01

P-1 factors

Date	Factor	B1	B2
2014-04-09	91657470786507365244847613528100079	2569240	0

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2018-09-28	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-11-27	Chang Chia-Tche	C-PRP	M2421053/91657470786507365244847613528100079 : B7792EB00739C3C8 PRP: Verified PRP without proof (not generated)
2017-10-13	Oliver Kruse	C-PRP	M2421053/91657470786507365244847613528100079 : B7792EB00739C3C8 PRP: Verified PRP without proof (not generated)
2014-04-09	mikr	F-PM1	Factor: 91657470786507365244847613528100079
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-04	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-12-18	markr	NF-PM1	B1=95000, B2=1923750, E=6
2010-11-16	Joss	NF-PM1	B1=20000
2010-11-09	Joss	NF-PM1	B1=15000
2009-01-13	Sturle Sunde	NF	no factor from 2^60 to 2^61