2 558 203 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
1426838864532133513957871	25	80.2	2009-02-15 18:48:32

ECM

Digits	B1	Curves
25	50000	176 / 280

Estimated T-Level: 23.1 ⓘ

TF below 2^72 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		Christopher Kolar	40C00E727BED2687	0	Linux 32-bit,Prime95,v13,(aka WP2)
Factored	1999-03-26	Bruce Mitchell	40C00E727BED2687	2261480	Windows,Prime95,v17,(aka WT1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-15	Oliver Kruse	D54D442D93F5B892	1	443090	5	3
Verified	PRP without proof (not generated)	2017-12-01	storm5510	D54D442D93F5B892	1	901955	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
2017-12-01	storm5510	C-PRP	M2558203/1426838864532133513957871 : D54D442D93F5B892
2017-10-15	Oliver Kruse	C-PRP	M2558203/1426838864532133513957871 : D54D442D93F5B892
2009-02-15	eteo	F-ECM	Factor: 1426838864532133513957871
2009-02-02	Sturle Sunde	NF	no factor TF: 60-61
2003-11-08	Team Prime Rib	NF-PM1	B1=15000, B2=198750
2003-10-23	-anonymous-	NF-PM1	B1=2048, B2=204800
1999-03-26	-anonymous-	C-LL	40C00E727BED2687
1999-03-15	-anonymous-	NF	no factor TF: 1-59