1 820 279 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
1348645055959869418159	22	70.2	2012-05-13 03:00:15
18591257656105278391249	23	74.0	2020-08-15 11:51:10

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 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)		Ken Kriesel	6957EB691E15C52A	0
Verified (Factored)	1999-02-21	Carl Mikkelsen	6957EB691E15C52A	977510

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-03	Oliver Kruse	2C2AEF89B38D7EC7	1	0	1	3
Verified (Factored)	2017-11-06	bayanne	2C2AEF89B38D7EC7	1	1633685	1	3
Verified	2020-08-15	M Miller	0D2CA6068F0CF9D2	2	1196143	5	3

History

Date	User	Type	Result
2020-08-15	Jorge Coveiro	CERT	PRP Certification Proof certified good
2020-08-15	M Miller	C-PRP	M1820279/1348645055959869418159/18591257656105278391249 : 0D2CA6068F0CF9D2 PRP proof power = 7 PRP: Verified Proof certified good
2020-08-15	_p95holder_	F-ECM	Factor: 18591257656105278391249 / (ECM curve 1, B1=50000, B2=5000000)
2017-11-06	bayanne	C-PRP	M1820279/1348645055959869418159 : 2C2AEF89B38D7EC7 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-03	Oliver Kruse	C-PRP	M1820279/1348645055959869418159 : 2C2AEF89B38D7EC7 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2012-05-13	omiXorp	F-ECM	Factor: 1348645055959869418159
2011-02-07	Carsten Kossendey	NF-PM1	B1=100000, B2=1675000, E=6
2011-01-21	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-09	Architects Cubed	NF	no factor from 2^60 to 2^61