2 875 489 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
63538730638481063431	20	65.8	2015-07-31 00:50:07

ECM

Digits	B1	Curves
25	50000	10 / 280

Estimated T-Level: 20.2 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		John Lyon	6444A9A1DF580E21	0
Verified (Factored)	1999-05-30	Lorenzo Laschi	6444A9A1DF580E21	2874132

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-23	Oliver Kruse	0289668BF778B507	1	1598203	5	3
Verified	2017-12-08	kkmrkkblmbrbk	0289668BF778B507	1	2362097	5	3

History

Date	User	Type	Result
2023-02-27	USAFSS	NF-PM1	B1=280000, B2=212023350
2017-12-08	kkmrkkblmbrbk	C-PRP	M2875489/63538730638481063431 : 0289668BF778B507 PRP: Verified PRP without proof (not generated)
2017-10-23	Oliver Kruse	C-PRP	M2875489/63538730638481063431 : 0289668BF778B507 PRP: Verified PRP without proof (not generated)
2015-07-31	KAMCOBILL	F-ECM	Factor: 63538730638481063431
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2012-01-21	markr	NF	no factor from 2^61 to 2^62
2011-02-07	markr	NF-PM1	B1=125000, B2=2812500, E=6
2011-01-22	Joss	NF-PM1	B1=50000
2010-12-23	Joss	NF-PM1	B1=20000
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=161250
2009-02-12	Sturle Sunde	NF	no factor from 2^60 to 2^61