2 488 253 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
389529429104347659985513	24	78.4	2014-11-21 01:38:54
55910285222055839015849983	26	85.5	2014-11-21 01:38:54

ECM

Digits	B1	Curves
25	50000	67 / 280

Estimated T-Level: 21.2 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Robert Clark	85DECD11D4DE409E	0
Verified (Factored)	1999-05-02	Robert Mutschler	85DECD11D4DE409E	9245

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-14	kkmrkkblmbrbk	94C459E12E708F1C	2	2438345	5	3
Verified	2017-11-06	Oliver Kruse	94C459E12E708F1C	2	1260119	5	3

P-1 factors

Date	Factor	B1	B2
2014-11-21	21778701483608656610004100716278432697267161296279	2382500	85770100

History

Date	User	Type	Result
2022-03-10	LordJulius	NF	no factor from 2^1 to 2^60
2017-11-06	Oliver Kruse	C-PRP	M2488253/389529429104347659985513/55910285222055839015849983 : 94C459E12E708F1C PRP: Verified PRP without proof (not generated)
2017-10-14	kkmrkkblmbrbk	C-PRP	M2488253/389529429104347659985513/55910285222055839015849983 : 94C459E12E708F1C PRP: Verified PRP without proof (not generated)
2014-11-21	mikr	F-PM1	Factor: 21778701483608656610004100716278432697267161296279 / (P-1, B1=2382500, B2=85770100, E=12)
2014-09-03	Joss	NF-PM1	B1=120795
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-10	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-21	Oscar Östlin	NF-PM1	B1=95000, B2=1947500, E=6
2010-12-22	Joss	NF-PM1	B1=20000
2009-01-14	Sturle Sunde	NF	no factor from 2^60 to 2^61