2 892 781 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
381229036517132930873	21	68.4	2020-12-31 15:51:50

ECM

Digits	B1	Curves
25	50000	60 / 280

Estimated T-Level: 21.1 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Eryk Hargrove	931B77CB499C0BC8	0
Verified (Factored)	2000-02-01	Krzysztof Leszczynski	931B77CB499C0BC8	1306633
Verified (Factored)	2018-09-28	kkmrkkblmbrbk	931B77CB499C0BC8	2170969

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-01-01	Niels_Mache_Nextcloud	181BE80CCC6B8519	1	2561057	5	3

History

Date	User	Type	Result
2021-01-01	curtisc	CERT	PRP Certification Proof certified good
2021-01-01	Niels_Mache_Nextcloud	C-PRP	M2892781/381229036517132930873 : 181BE80CCC6B8519 PRP proof power = 7 PRP: Verified Proof certified good
2020-12-31	MarkS	F-ECM	Factor: 381229036517132930873 / (ECM curve 11, B1=50000, B2=5000000, Sigma=6778419557490059)
2020-02-11	masser	NF-PM1	B1=5000000, B2=200000000, E=12
2019-10-23	masser	NF-PM1	B1=2900000, B2=29000000, e=12
2019-01-12	chuenkit	NF	no factor from 2^67 to 2^68
2018-09-28	kkmrkkblmbrbk	C-LL	931B77CB499C0BC8
2017-11-16	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-10-21	Joss	NF-PM1	B1=597196, B2=5971960, E=6
2017-02-25	Joss	NF-PM1	B1=298598, B2=2985980, E=6
2016-12-14	Joss	NF-PM1	B1=248832
2016-10-27	Joss	NF-PM1	B1=172800
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2015-11-28	omylist	NF	no factor from 2^65 to 2^66
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-01-14	markr	NF	no factor from 2^61 to 2^62
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61