2 491 331 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁶³

Factored

Factor	Digits	Bits	Date
1050775236560986049	19	59.9	old

ECM

Digits	B1	Curves
25	50000	194 / 280

Estimated T-Level: 23.5 ⓘ

TF below 2^73 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		David Cuciz	F8B6CCC43F52E970	0	Windows 16-bit,Prime95,v13,PFA,(aka WP0)
Factored	1999-05-23	Frank Fullum	F8B6CCC43F52E970	897104	Windows,Prime95,v17,NT service,(aka WT5)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-14	Oliver Kruse	EEF384C5288DAB7D	1	750090	5	3
Verified	PRP without proof (not generated)	2017-11-30	storm5510	EEF384C5288DAB7D	1	2369154	5	3

History

Date	User	Type	Result
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-11-30	storm5510	C-PRP	M2491331/1050775236560986049 : EEF384C5288DAB7D
2017-10-14	Oliver Kruse	C-PRP	M2491331/1050775236560986049 : EEF384C5288DAB7D
2003-10-31	Team Prime Rib	F-PM1	Factor: 1050775236560986049
2003-10-23	-anonymous-	F-PM1	Factor: 1050775236560986049
1999-05-23	-anonymous-	C-LL	F8B6CCC43F52E970
1999-05-02	-anonymous-	NF	no factor TF: 1-59