426 973 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
1491308696630034820519789078231	31	100.2	2019-05-03 09:16:19

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	227 / 640

Estimated T-Level: 26.8 ⓘ

TF below 2^84 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	2654	0
Verified (Factored)		Jens J Loesel	CBA20A77A260A654	0
Verified (Factored)		Eivind Triel	CBA20A77A260A654	410531
Verified (Factored)	2002-01-02	Dennis Pope	CBA20A77A260A654	141727

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-05-03	matzetoni	B8A7F0CB2686C451	1	328757	5	3
Verified	2019-05-04	artorollo	B8A7F0CB2686C451	1	313587	5	3

History

Date	User	Type	Result
2019-05-04	artorollo	C-PRP	M426973/1491308696630034820519789078231 : B8A7F0CB2686C451 PRP: Verified PRP without proof (small exponent)
2019-05-03	matzetoni	C-PRP	M426973/1491308696630034820519789078231 : B8A7F0CB2686C451 PRP: Verified PRP without proof (small exponent)
2019-05-03	alex	F-ECM	Factor: 1491308696630034820519789078231 / (ECM curve 111, B1=250000, B2=25000000, Sigma=1269314668182683)
2018-12-09	Gordon Spence	NF	no factor from 2^65 to 2^66
2017-12-21	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-11-15	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-15	Gordon Spence	NF	no factor from 2^62 to 2^63
2013-01-03	markr	NF-PM1	B1=25000000, B2=1000000000, E=12
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
2012-05-29	Joss	NF-PM1	B1=3004512
2011-08-09	Joss	NF-PM1	B1=1001504
2010-08-01	Rob_Dee	NF-PM1	B1=1000000, B2=2000000, E=6
2010-07-31	Rob_Dee	NF-PM1	B1=500000, B2=1000000