1 955 609 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
85718316241670049983	20	66.2	2012-11-26 01:51:58
21362302500265721163977	23	74.2	2021-02-28 17:55:49

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Al Lovrich	CD8E670D1EC7E087	0
Verified (Factored)	1998-12-27	Bruce Mitchell	CD8E670D1EC7E087	229050

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	C7E3752B229776D0	1	0	1	3
Verified (Factored)	2017-11-11	kkmrkkblmbrbk	C7E3752B229776D0	1	562735	1	3
Verified	2021-03-02	-Anonymous-	6CB31631783C2164	2	1119983	5	3
Verified	2021-03-15	Anton Repko	6CB31631783C2164	2	1465987	5	3

History

Date	User	Type	Result
2021-04-15	curtisc	CERT	PRP Certification Proof certified good
2021-03-15	curtisc	CERT	PRP Certification Proof certified good
2021-03-15	Anton Repko	C-PRP	M1955609/85718316241670049983/21362302500265721163977 : 6CB31631783C2164 PRP proof power = 7 PRP: Verified Proof certified good
2021-03-02	-Anonymous-	C-PRP	M1955609/85718316241670049983/21362302500265721163977 : 6CB31631783C2164 PRP proof power = 7 PRP: Verified Proof certified good
2021-02-28	Poao	F-ECM	Factor: 21362302500265721163977 / (ECM curve 5, B1=50000, B2=5000000, Sigma=8980873228998009)
2017-11-11	kkmrkkblmbrbk	C-PRP	M1955609/85718316241670049983 : C7E3752B229776D0 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1955609/85718316241670049983 : C7E3752B229776D0 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2012-11-26	Torchwood Institute	F-ECM	Factor: 85718316241670049983
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-05-10	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2010-01-14	S485122	NF	no factor from 2^60 to 2^61