2 638 897 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
28910363853611599927	20	64.6	2010-06-23 22:03:30

ECM

Digits	B1	Curves
25	50000	5 / 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)		Jeffrey L. Vagle	BCCF8BE844E28048	0
Verified (Factored)	1999-05-23	Bert Radke	BCCF8BE844E28048	2279961

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-18	Oliver Kruse	31B951C7E24BEF8B	1	1796216	5	3
Verified	2017-12-03	kkmrkkblmbrbk	31B951C7E24BEF8B	1	2440622	5	3

History

Date	User	Type	Result
2022-03-11	LordJulius	NF	no factor from 2^1 to 2^60
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-12-03	kkmrkkblmbrbk	C-PRP	M2638897/28910363853611599927 : 31B951C7E24BEF8B PRP: Verified PRP without proof (not generated)
2017-10-18	Oliver Kruse	C-PRP	M2638897/28910363853611599927 : 31B951C7E24BEF8B PRP: Verified PRP without proof (not generated)
2010-06-23	KAMCOBILL	F-ECM	Factor: 28910363853611599927
2009-06-21	USAFSS	NF-PM1	B1=30000, B2=420000
2009-01-27	Sturle Sunde	NF	no factor from 2^60 to 2^61