2 258 917 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 2⁶²

Factored

Factor	Digits	Bits	Date
3396897640568983679	19	61.6	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	144 / 640

Estimated T-Level: 26.1 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		Stephen Nichols	420576A07F2272CE	0	Windows,Prime95,v13,(aka WP1)
Factored		Tom Cage	420576A07F2272CE	0	Mac,John Sweeney,vLL1.0b1,(aka J4)
Factored	1998-03-17	Dongsheng Liu	420576A07F2272CE	0	Windows,Prime95,v14,(aka WQ1)
Bad	1999-02-14	David Phillips	D9C67D5A751870C7	1361282	Windows,Prime95,v17,(aka WT1)
Factored	2019-05-06	MadPoo 🙂	420576A07F2272CE	1670883	Windows 64-bit,Prime95,v29.4,(aka Wg4)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-10	Oliver Kruse	7917575F727A625C	1	0	1	3
Verified	PRP without proof (not generated)	2017-11-21	storm5510	7917575F727A625C	1	822897	1	3

History

Date	User	Type	Result
2019-05-06	MadPoo 🙂	C-LL	420576A07F2272CE
2017-11-21	storm5510	C-PRP	M2258917/3396897640568983679 : 7917575F727A625C
2017-10-10	Oliver Kruse	C-PRP	M2258917/3396897640568983679 : 7917575F727A625C
2016-04-14	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2000-02-01	Alex Kruppa	F	Factor: 3396897640568983679
1999-02-14	-anonymous-	C-LL	D9C67D5A751870C7
1998-03-17	-anonymous-	NF	no factor TF: 1-58
1998-03-17	-anonymous-	C-LL	420576A07F2272CE