1 480 733 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
38421608927093572727	20	65.1	2013-06-09 10:16:34

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 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)		Mikko Tommila	E4B8F61660B1316B	0
Verified (Factored)		Marc-Etienne Vargenau	E4B8F61660B1316B	0

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-01	Kriesel	42C530C06A41FEC9	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-01	Oliver Kruse	01F0AA521198D1CE	1	0	1	3
Verified	2017-10-28	kkmrkkblmbrbk	01F0AA521198D1CE	1	63193	1	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	42C530C06A41FEC9 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2023-10-24	Anton Tsvetkov	NF-PM1	B1=5000000, B2=1006114200
2017-10-28	kkmrkkblmbrbk	C-PRP	M1480733/38421608927093572727 : 01F0AA521198D1CE PRP: Verified PRP without proof (not generated)
2017-10-01	Oliver Kruse	C-PRP	M1480733/38421608927093572727 : 01F0AA521198D1CE PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2013-06-09	Chang Chia-Tche	F-ECM	Factor: 38421608927093572727
2011-04-05	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-12-17	Rob_Dee	NF-PM1	B1=200000, B2=5000000, E=6
2010-12-16	Rob_Dee	NF-PM1	B1=200000, B2=4000000, E=6
2010-12-15	Rob_Dee	NF-PM1	B1=200000, B2=3000000, E=6
2010-12-14	Rob_Dee	NF-PM1	B1=200000, B2=2000000, E=6
2010-12-13	Rob_Dee	NF-PM1	B1=200000, B2=1000000, E=6
2010-12-12	Rob_Dee	NF-PM1	B1=200000, B2=300000
2010-12-11	Rob_Dee	NF-PM1	B1=100000, B2=200000
2010-05-05	Architects Cubed	NF	no factor from 2^60 to 2^61