2 421 907 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
19793949409515701969449	23	74.1	2021-01-07 04:57:47

ECM

Digits	B1	Curves
25	50000	104 / 280

Estimated T-Level: 21.9 ⓘ

TF below 2^68 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		John Lloyd	4C431E51C088743D	0
Verified (Factored)	1999-03-26	David Yip	4C431E51C088743D	1436388
Verified (Factored)	2018-05-20	kkmrkkblmbrbk	4C431E51C088743D	1477916

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-01-07	mrh	508AA0E754636EC3	1	951723	5	3
Verified	2021-01-07	Lisander Viaene	508AA0E754636EC3	1	353370	5	3

History

Date	User	Type	Result
2021-01-07	curtisc	CERT	PRP Certification Proof certified good
2021-01-07	Lisander Viaene	C-PRP	M2421907/19793949409515701969449 : 508AA0E754636EC3 PRP proof power = 7 PRP: Verified Proof certified good
2021-01-07	Ben Delo	CERT	PRP Certification Proof certified good
2021-01-07	mrh	C-PRP	M2421907/19793949409515701969449 : 508AA0E754636EC3 PRP proof power = 7 PRP: Verified Proof certified good
2021-01-07	Chang Chia-Tche	F-ECM	Factor: 19793949409515701969449 / (ECM curve 1, B1=50000, B2=5000000, Sigma=5991997950682457)
2020-12-27	Anton Repko	NF	no factor from 2^68 to 2^70
2019-04-29	TJAOI	NF	no factor from 2^67 to 2^68
2018-05-20	kkmrkkblmbrbk	C-LL	4C431E51C088743D
2017-07-05	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
2015-10-23	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
2014-04-13	mikr	NF-PM1	B1=2569240, B2=69524000, E=12
2013-12-04	Jerry Hallett	NF	no factor from 2^62 to 2^63
2012-06-04	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-23	Oscar Östlin	NF-PM1	B1=95000, B2=1923750, E=6
2010-11-12	Oscar Östlin	NF-PM1	B1=75011
2009-01-14	Sturle Sunde	NF	no factor from 2^60 to 2^61