2 973 889 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
7894897600304269132159	22	72.7	2015-05-08 13:54:11

ECM

Digits	B1	Curves
25	50000	63 / 280

Estimated T-Level: 21.1 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Robert Wilhelm	38A06AC7923AA7AD	0
Verified (Factored)	1999-08-07	Rob Lesan	38A06AC7923AA7AD	1542232

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-26	Oliver Kruse	F77DDD4B6BDB0C5B	1	1043158	5	3
Verified	2017-12-09	kkmrkkblmbrbk	F77DDD4B6BDB0C5B	1	1636218	5	3

P-1 factors

Date	Factor	B1	B2
2015-05-08	7894897600304269132159	1000000	0

History

Date	User	Type	Result
2022-12-04	USAFSS	NF-PM1	B1=640000, B2=541842840
2017-12-09	kkmrkkblmbrbk	C-PRP	M2973889/7894897600304269132159 : F77DDD4B6BDB0C5B PRP: Verified PRP without proof (not generated)
2017-10-26	Oliver Kruse	C-PRP	M2973889/7894897600304269132159 : F77DDD4B6BDB0C5B PRP: Verified PRP without proof (not generated)
2015-05-08	VictordeHollander	F-PM1	Factor: 7894897600304269132159 / (P-1, B1=1000000)
2015-04-29	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-29	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-11-29	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-10-27	markr	NF-PM1	B1=95000, B2=1995000, E=6
2009-02-14	Sturle Sunde	NF	no factor from 2^60 to 2^61