2 398 559 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
15978112886864630039	20	63.8	2010-12-23 07:54:00

ECM

Digits	B1	Curves
25	50000	137 / 280

Estimated T-Level: 22.4 ⓘ

TF below 2^70 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Tom Waskow	19838808BEBAC167	0
Verified (Factored)	1999-04-02	Peter Brockman	19838808BEBAC167	1411027

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-12	Oliver Kruse	B920A170581C80C1	1	1684225	5	3
Verified	2017-11-26	kkmrkkblmbrbk	B920A170581C80C1	1	1983627	5	3

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	M2398559/15978112886864630039 : B920A170581C80C1 PRP: Verified PRP without proof (not generated)
2017-10-12	Oliver Kruse	C-PRP	M2398559/15978112886864630039 : B920A170581C80C1 PRP: Verified PRP without proof (not generated)
2010-12-23	markr	F-PM1	Factor: 15978112886864630039
2010-11-16	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