2 228 341 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
2155414006017684936463	22	70.9	2013-06-25 10:25:40
861155517044326278037663	24	79.5	2016-04-09 13:17:14

ECM

Digits	B1	Curves
25	50000	88 / 280

Estimated T-Level: 21.6 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Bruce Hebden	7E03E80788ECF4A4	0
Verified (Factored)		Andy Kohler	7E03E80788ECF4A4	0
Verified (Factored)	1999-05-02	Eugene Sung	7E03E80788ECF4A4	1563830

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-09	Oliver Kruse	9742A362DFD25225	1	0	1	3
Verified	2017-10-18	Oliver Kruse	A904AA9E8B90875D	2	1588476	5	3
Verified	2017-11-20	kkmrkkblmbrbk	A904AA9E8B90875D	2	732314	5	3

P-1 factors

Date	Factor	B1	B2
2016-04-09	861155517044326278037663	500000	15000000

History

Date	User	Type	Result
2021-06-29	Dylan Delgado	NF-PM1	B1=1000000, B2=106000000
2017-11-20	kkmrkkblmbrbk	C-PRP	M2228341/2155414006017684936463/861155517044326278037663 : A904AA9E8B90875D PRP: Verified PRP without proof (not generated)
2017-10-18	Oliver Kruse	C-PRP	M2228341/2155414006017684936463/861155517044326278037663 : A904AA9E8B90875D PRP: Verified PRP without proof (not generated)
2017-10-09	Oliver Kruse	C-PRP	M2228341/2155414006017684936463/861155517044326278037663 : 9742A362DFD25225 PRP: Verified PRP without proof (not generated)
2016-04-09	alpertron	F-PM1	Factor: 861155517044326278037663 / (P-1, B1=500000, B2=15000000, E=12)
2013-06-25	hiems	F-ECM	Factor: 2155414006017684936463
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-04-20	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-13	Oscar Östlin	NF-PM1	B1=85000, B2=1615000, E=6
2010-10-24	Oscar Östlin	NF-PM1	B1=75011
2009-01-11	Sturle Sunde	NF	no factor from 2^60 to 2^61