7 999 813 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
104400188035520052311	21	66.5	2016-08-22 22:11:15

ECM

Digits	B1	Curves
25	50000	3 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1999-09-07	Ryan Smith	64D8CA36BA02215F	7699040
Verified (Factored)	2002-07-20	Marco Voerman	64D8CA36BA02215F	3683121

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2018-07-05	_p95holder_	83C6527A104822AD	1	103047	5	3
Verified	2019-06-17	timbit	83C6527A104822AD	1	4753116	5	3

History

Date	User	Type	Result
2025-10-26	Sid & Andy	NF-PM1	B1=2300000, B2=3731746200
2019-06-17	timbit	C-PRP	M7999813/104400188035520052311 : 83C6527A104822AD PRP: Verified PRP without proof (not generated)
2018-07-05	_p95holder_	C-PRP	M7999813/104400188035520052311 : 83C6527A104822AD PRP: Verified PRP without proof (not generated)
2016-08-22	Gordon Spence	F	Factor: 104400188035520052311 / TF: 66-67
2015-06-09	VictordeHollander	NF	no factor from 2^65 to 2^66
2013-12-23	David Campeau	NF	no factor from 2^64 to 2^65
2013-09-19	Nesowa	NF	no factor from 2^63 to 2^64
2012-07-29	Squeeky_Squirrel	NF-PM1	B1=100000, B2=1950000, E=6