1 247 401 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁶⁰

Factored

Factor	Digits	Bits	Date
3616854195413490352936543	25	81.6	2017-12-01 13:38:23

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	104 / 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		Joel Armengaud	35D2B840A572E0AE	0	Windows,Prime95,v11,(aka WC)
Factored		Cornelius Caesar	35D2B840A572E0AE	0	Mac,John Sweeney,v1.4,(aka J3)
Factored		Ricardo Montiel	35D2B840A572E0AE	0	Mac,John Sweeney,v1.4,(aka J3)
Factored	2015-11-12	MadPoo 🙂	35D2B840A572E0AE	367147	Windows 64-bit,Prime95,v26,(aka We4)

Status	Proof	Date	User	Residue	Shift	Type	Base
Factored	Certified Good Power=6	2025-09-01	Kriesel	F888362BA77BE622	0	1	3

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-12-02	Chun sung soo	F888362BA77BE622	1	685642	5	3
Verified	PRP without proof (not generated)	2017-12-02	storm5510	F888362BA77BE622	1	782040	5	3

History

Date	User	Type	Result
2025-09-02	BigHero8	CERT	Proof certified good
2025-09-01	Kriesel	C-PRP	F888362BA77BE622 Proof Certified Good Proof Power: 6
2017-12-02	storm5510	C-PRP	M1247401/3616854195413490352936543 : F888362BA77BE622
2017-12-02	Chun sung soo	C-PRP	M1247401/3616854195413490352936543 : F888362BA77BE622
2017-12-01	TJAOI	F-ECM	Factor: 3616854195413490352936543
2016-02-23	Mark Rose	NF	no factor TF: 58-60
2015-11-12	MadPoo 🙂	C-LL	35D2B840A572E0AE
2015-09-20	ramgeis	NF	no factor TF: 65-66
2015-04-06	monst	NF	no factor TF: 64-65
2015-04-05	omylist	NF	no factor TF: 63-64
2015-01-15	mikr	NF-PM1	B1=4218475, B2=156083565, E=12
2014-09-25	Joss	NF-PM1	B1=251454
2012-10-07	dbaugh	NF	no factor TF: 62-63
2012-09-14	Axelsson	NF	no factor TF: 61-62
2009-02-16	Sturle Sunde	NF	no factor TF: 60-61
2003-11-28	eteo	NF-PM1	B1=200000, B2=2000000, E=6
2003-06-01	-anonymous-	NF	no factor TF: 1-58
2003-02-24	-anonymous-	NF-PM1	B1=2048, B2=204800, E=12
2001-11-17	-anonymous-	NF	no factor TF: 1-57