2 585 647 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
1181871092099827631207	22	70.0	2020-07-18 23:25:19

ECM

Digits	B1	Curves
25	50000	43 / 280

Estimated T-Level: 20.8 ⓘ

TF below 2^64 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Thomas Honold	8D911664C72C5C00	0
Verified (Factored)	1999-04-13	C. Cooper / S. Boone	8D911664C72C5C00	2116875
Verified (Factored)	2018-06-21	kkmrkkblmbrbk	8D911664C72C5C00	863498

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-07-19	M Miller	1570F4946CB66A0E	1	1276388	5	3
Verified	2020-07-20	pew	1570F4946CB66A0E	1	2280873	5	3

History

Date	User	Type	Result
2020-07-20	pew	C-PRP	M2585647/1181871092099827631207 : 1570F4946CB66A0E PRP: Verified PRP without proof (not generated)
2020-07-19	M Miller	C-PRP	M2585647/1181871092099827631207 : 1570F4946CB66A0E PRP: Verified PRP without proof (not generated)
2020-07-18	nordi	F-ECM	Factor: 1181871092099827631207 / (ECM curve 1, B1=50000, B2=5000000, Sigma=7056520864366174)
2019-06-30	lycorn	NF	no factor from 2^67 to 2^68
2018-06-21	kkmrkkblmbrbk	C-LL	8D911664C72C5C00
2017-08-20	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-08-01	mikr	NF-PM1	B1=3200000, B2=112000000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-11-08	ramgeis	NF	no factor from 2^65 to 2^66
2015-02-27	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-27	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-21	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-10-12	markr	NF-PM1	B1=175000, B2=4112500, E=6
2011-01-12	Joss	NF-PM1	B1=50000
2010-11-15	Joss	NF-PM1	B1=20000
2009-01-31	Sturle Sunde	NF	no factor from 2^60 to 2^61