423 887 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
2028940618736752347945068474103431	34	110.6	2019-05-05 16:19:07

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	327 / 640

Estimated T-Level: 27.6 ⓘ

TF below 2^87 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Alex and Nick Myrman	BCE	0
Verified (Factored)		Jean-Charles Meyrignac	3AA50DD2AFACABCE	0
Verified (Factored)		Cornelius Caesar	3AA50DD2AFACABCE	0
Verified (Factored)		Eivind Triel	3AA50DD2AFACABCE	269237
Verified (Factored)	2016-06-01	MadPoo	3AA50DD2AFACABCE	409733

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-05-06	Niels_Mache_Nextcloud	6613AFDF2BB3D30D	1	211692	5	3
Verified	2019-05-07	marssystems	6613AFDF2BB3D30D	1	179745	5	3

History

Date	User	Type	Result
2019-05-07	marssystems	C-PRP	M423887/2028940618736752347945068474103431 : 6613AFDF2BB3D30D PRP: Verified PRP without proof (small exponent)
2019-05-06	Niels_Mache_Nextcloud	C-PRP	M423887/2028940618736752347945068474103431 : 6613AFDF2BB3D30D PRP: Verified PRP without proof (small exponent)
2019-05-05	alex	F-ECM	Factor: 2028940618736752347945068474103431 / (ECM curve 211, B1=250000, B2=25000000, Sigma=7823793750044945)
2018-12-09	Gordon Spence	NF	no factor from 2^65 to 2^66
2017-12-18	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-06-01	MadPoo	C-LL	3AA50DD2AFACABCE
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-11-14	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-14	Gordon Spence	NF	no factor from 2^62 to 2^63
2012-12-01	dbaugh	NF	no factor from 2^61 to 2^62
2012-11-27	dbaugh	NF	no factor from 2^60 to 2^61
2012-08-23	markr	NF-PM1	B1=10000000, B2=400000000, E=12
2012-03-10	Joss	NF-PM1	B1=1263710
2011-08-06	Joss	NF-PM1	B1=1010968
2010-07-26	Rob_Dee	NF-PM1	B1=1000000, B2=2000000, E=6
2010-07-25	Rob_Dee	NF-PM1	B1=500000, B2=1000000