1 333 193 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Details

Composite, with 2 known prime factors. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁶⁰

Factored

Factor	Digits	Bits	Date
145721029032186639697	21	67.0	2014-06-22 18:50:39
8611208856861999247736351	25	82.8	2018-06-08 13:20:41

P-1 factors

Date	Factors	B1	B2
2014-06-22	145721029032186639697	4081679	151022134

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 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	Software
Factored		George Woltman	F74F529D0C468106	0	Windows,Prime95,v11,(aka WC)
Factored		Cornelius Caesar	F74F529D0C468106	0	Mac,John Sweeney,vLL1.0b1,(aka J4)
Factored		Brian J. Beesley	F74F529D0C468106	665002	Linux 32-bit,Prime95,v24 final,(aka Wc2)

Status	Proof	Date	User	Residue	Shift	Type	Base
Factored	Certified Good Power=6	2025-09-01	Kriesel	043C20756F7DE79D	0	1	3

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Factored	PRP without proof (not generated)	2017-09-30	Oliver Kruse	A2EA730C81CDB936	1	0	1	3
Factored	PRP without proof (not generated)	2017-10-23	kkmrkkblmbrbk	A2EA730C81CDB936	1	1252558	1	3
Verified	PRP without proof (not generated)	2018-06-09	storm5510	043C20756F7DE79D	2	1288161	5	3
Verified	PRP without proof (not generated)	2018-06-10	Daniil Tsarkov	043C20756F7DE79D	2	655598	5	3
Verified	PRP without proof (not generated)	2018-06-10	Battlemaxx	043C20756F7DE79D	2	1154147	5	3

History

Date	User	Type	Result
2025-09-03	V0rtex762	CERT	Proof certified good
2025-09-01	Kriesel	C-PRP	043C20756F7DE79D Proof Certified Good Proof Power: 6
2022-03-07	LordJulius	NF	no factor TF: 58-60
2018-06-10	Battlemaxx	C-PRP	M1333193/145721029032186639697/8611208856861999247736351 : 043C20756F7DE79D
2018-06-10	Daniil Tsarkov	C-PRP	M1333193/145721029032186639697/8611208856861999247736351 : 043C20756F7DE79D
2018-06-09	storm5510	C-PRP	M1333193/145721029032186639697/8611208856861999247736351 : 043C20756F7DE79D
2018-06-08	TJAOI	F-ECM	Factor: 8611208856861999247736351
2017-10-23	kkmrkkblmbrbk	C-PRP	M1333193/145721029032186639697 : A2EA730C81CDB936
2017-09-30	Oliver Kruse	C-PRP	M1333193/145721029032186639697 : A2EA730C81CDB936
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2014-06-22	mikr	F-PM1	Factor: 145721029032186639697 / B1=4081679, B2=151022134
2014-04-25	-anonymous-	NF-PM1	B1=175000
2013-01-10	dbaugh	NF	no factor TF: 62-63
2012-09-17	Axelsson	NF	no factor TF: 61-62
2009-02-26	Sturle Sunde	NF	no factor TF: 60-61
2003-09-21	megavink	NF-PM1	B1=15000, B2=213750
2003-09-21	Team Prime Rib	NF-PM1	B1=15000, B2=213750
2003-06-23	-anonymous-	NF	no factor TF: 1-58