1 378 831 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
2953163190589209653007089	25	81.3	2014-09-15 15:11:21
544477335781983340278703289	27	88.8	2014-09-15 15:11:21

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 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)		David Slowinski	1EC5A	0
Verified (Factored)		Joel Armengaud	665689B02747EC5A	0
Verified (Factored)	2002-10-07	S57483	665689B02747EC5A	1209299

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-05	Oliver Kruse	B42131F578B2CFF2	2	0	1	3
Verified	2017-10-24	kkmrkkblmbrbk	B42131F578B2CFF2	2	321790	1	3

P-1 factors

Date	Factor	B1	B2
2014-09-15	1607930426141434367790637581417486078100884444615721	3106900	111849000

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^58 to 2^60
2017-10-24	kkmrkkblmbrbk	C-PRP	M1378831/2953163190589209653007089/544477335781983340278703289 : B42131F578B2CFF2 PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1378831/2953163190589209653007089/544477335781983340278703289 : B42131F578B2CFF2 PRP: Verified PRP without proof (not generated)
2017-09-30	Oliver Kruse	C-PRP	M1378831/2953163190589209653007089/544477335781983340278703289 : B42131F578B2CFF2 PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2014-09-15	mikr	F-PM1	Factor: 1607930426141434367790637581417486078100884444615721 / (P-1, B1=3106900, B2=111849000, E=12)
2014-04-22	Joss	NF-PM1	B1=200000
2014-04-16	Joss	NF-PM1	B1=120000
2014-04-15	-Anonymous-	NF-PM1	B1=110000
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-09-26	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-02-24	Sturle Sunde	NF	no factor from 2^60 to 2^61