2 225 621 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
27950438069349506287	20	64.6	2013-06-18 05:38:59

ECM

Digits	B1	Curves
25	50000	105 / 280

Estimated T-Level: 21.9 ⓘ

TF below 2^68 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		John Lloyd	8C7E76BFDAF0AFDD	0
Verified (Factored)	1999-02-21	Robert Walker	8C7E76BFDAF0AFDD	935584

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-09	Oliver Kruse	C09954DC5301AB95	1	0	1	3
Verified	2017-11-20	kkmrkkblmbrbk	C09954DC5301AB95	1	1614758	1	3

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2017-11-20	kkmrkkblmbrbk	C-PRP	M2225621/27950438069349506287 : C09954DC5301AB95 PRP: Verified PRP without proof (not generated)
2017-10-09	Oliver Kruse	C-PRP	M2225621/27950438069349506287 : C09954DC5301AB95 PRP: Verified PRP without proof (not generated)
2016-04-05	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2013-06-18	Xyzzy	F-ECM	Factor: 27950438069349506287
2012-04-19	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-12	Oscar Östlin	NF-PM1	B1=85000, B2=1593750, E=6
2010-10-21	Oscar Östlin	NF-PM1	B1=75011
2009-01-11	Sturle Sunde	NF	no factor from 2^60 to 2^61