2 628 139 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
3333245669399456647	19	61.5	2010-06-16 23:53:49

ECM

Digits	B1	Curves
25	50000	158 / 280

Estimated T-Level: 22.8 ⓘ

TF below 2^71 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		David Linton	CE2E21A5BE6AD3A7	0	Windows,Prime95,v14,(aka WQ1)
Factored	1999-04-02	Mitch Day	CE2E21A5BE6AD3A7	722260	Windows,Prime95,v17,(aka WT1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-17	Oliver Kruse	6290AD36BF56C114	1	2501035	5	3
Verified	PRP without proof (not generated)	2017-12-02	storm5510	6290AD36BF56C114	1	2101288	5	3

History

Date	User	Type	Result
2022-03-11	LordJulius	NF	no factor TF: 1-60
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-12-02	storm5510	C-PRP	M2628139/3333245669399456647 : 6290AD36BF56C114
2017-10-17	Oliver Kruse	C-PRP	M2628139/3333245669399456647 : 6290AD36BF56C114
2010-06-16	Lupo	F-ECM	Factor: 3333245669399456647
2009-01-29	Sturle Sunde	NF	no factor TF: 60-61
2003-11-08	Team Prime Rib	NF-PM1	B1=15000, B2=217500
2003-10-31	-anonymous-	NF-PM1	B1=2048, B2=204800
1999-04-02	-anonymous-	C-LL	CE2E21A5BE6AD3A7
1999-03-26	-anonymous-	NF	no factor TF: 1-59