2 390 449 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
1287537889332434826126657937	28	90.1	2015-11-22 00:29:39

ECM

Digits	B1	Curves
25	50000	69 / 280

Estimated T-Level: 21.2 ⓘ

TF below 2^66 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-06-29	Herb Savage	17787C401581F9D6	0
Verified (Factored)	1999-04-13	Nicholas Thomas	17787C401581F9D6	2245238

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-12	Oliver Kruse	7223359B6A3ED16F	1	1385537	5	3
Verified	2017-11-26	kkmrkkblmbrbk	7223359B6A3ED16F	1	486220	5	3

P-1 factors

Date	Factor	B1	B2
2015-11-22	1287537889332434826126657937	3000000	100000000

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
2017-11-26	kkmrkkblmbrbk	C-PRP	M2390449/1287537889332434826126657937 : 7223359B6A3ED16F PRP: Verified PRP without proof (not generated)
2017-10-12	Oliver Kruse	C-PRP	M2390449/1287537889332434826126657937 : 7223359B6A3ED16F PRP: Verified PRP without proof (not generated)
2015-11-22	mikr	F-PM1	Factor: 1287537889332434826126657937 / (P-1, B1=3000000, B2=100000000, E=12)
2015-11-02	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-10	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-10	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-15	-Anonymous-	NF-PM1	B1=126850
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-01	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-12-25	markr	NF-PM1	B1=100000, B2=2075000, E=6
2010-11-15	Joss	NF-PM1	B1=20000
2010-11-08	Joss	NF-PM1	B1=15000
2009-01-16	Sturle Sunde	NF	no factor from 2^60 to 2^61