2 488 121 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
21493127881031512279439	23	74.2	2021-11-03 16:06:12

ECM

Digits	B1	Curves
25	50000	146 / 280

Estimated T-Level: 22.6 ⓘ

TF below 2^70 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Robert Clark	C458B67B572081E2	0
Verified (Factored)	1999-05-16	Stefan Wenzel	C458B67B572081E2	1326369
Verified (Factored)	2018-05-31	kkmrkkblmbrbk	C458B67B572081E2	1986653

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-11-04	SRJ2877	886D20A7F95A6369	1	2314401	5	3

History

Date	User	Type	Result
2021-11-04	WR	CERT	PRP Certification Proof certified good
2021-11-04	SRJ2877	C-PRP	M2488121/21493127881031512279439 : 886D20A7F95A6369 PRP proof power = 7 PRP: Verified Proof certified good
2021-11-03	daveward2005	F-ECM	Factor: 21493127881031512279439 / (ECM curve 3, B1=50000, B2=5000000, Sigma=8495970464025224)
2021-06-10	TJAOI	NF	no factor from 2^68 to 2^69
2019-05-20	TJAOI	NF	no factor from 2^67 to 2^68
2018-05-31	kkmrkkblmbrbk	C-LL	C458B67B572081E2
2017-07-24	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-10-30	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-03	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-03	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-11-20	mikr	NF-PM1	B1=2382500, B2=85770100, E=12
2014-09-03	Joss	NF-PM1	B1=120796
2013-12-04	Jerry Hallett	NF	no factor from 2^62 to 2^63
2012-06-10	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-21	Oscar Östlin	NF-PM1	B1=95000, B2=1947500, E=6
2010-12-22	Joss	NF-PM1	B1=20000
2009-01-14	Sturle Sunde	NF	no factor from 2^60 to 2^61