4 397 779 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
378386194368096571368307951	27	88.3	2018-12-31 08:39:27

ECM

Digits	B1	Curves
25	50000	9 / 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)		Fredrick Shelton	5DF1B22B4B98A78A	0
Verified (Factored)	1999-12-23	Mr. Allan Flatt	5DF1B22B4B98A78A	1095193

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-01-01	trebor	2AF68D3CA6EA9A03	1	3949528	5	3
Verified	2019-01-02	kkmrkkblmbrbk	2AF68D3CA6EA9A03	1	779432	5	3

P-1 factors

Date	Factor	B1	B2
2018-12-31	378386194368096571368307951	2237739	62656681

History

Date	User	Type	Result
2019-01-02	kkmrkkblmbrbk	C-PRP	M4397779/378386194368096571368307951 : 2AF68D3CA6EA9A03 PRP: Verified PRP without proof (not generated)
2019-01-01	trebor	C-PRP	M4397779/378386194368096571368307951 : 2AF68D3CA6EA9A03 PRP: Verified PRP without proof (not generated)
2018-12-31	Ismo Laitela	F-PM1	Factor: 378386194368096571368307951 / (P-1, B1=2237739, B2=62656681, E=12)
2018-10-30	chuenkit	NF	no factor from 2^67 to 2^68
2018-05-07	chuenkit	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-06-20	snme2pm1	NF	no factor from 2^65 to 2^66
2014-08-01	lycorn	NF	no factor from 2^64 to 2^65
2014-08-01	Jayder	NF	no factor from 2^63 to 2^64
2012-02-29	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2012-01-14	Squeeky_Squirrel	NF-PM1	B1=110000, B2=2255000, E=6
2010-11-04	markr	NF	no factor from 2^61 to 2^62
2009-08-09	Carsten Kossendey	NF-PM1	B1=25000, B2=356250