1 499 779 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 2⁶¹

Factored

Factor	Digits	Bits	Date
7033963511	10	32.7	old
38966460233227715737	20	65.1	2018-05-23 14:11:28

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	Proof	Date	User	Residue	Shift	Type	Base
Factored	Certified Good Power=6	2025-09-01	Kriesel	21A3B87C184AEA64	0	1	3

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Factored	PRP without proof (not generated)	2017-10-01	Oliver Kruse	6E08BB98B32C4CE3	1	0	1	3
Factored	PRP without proof (not generated)	2017-10-29	kkmrkkblmbrbk	6E08BB98B32C4CE3	1	1051781	1	3
Verified	PRP without proof (not generated)	2018-05-24	storm5510	21A3B87C184AEA64	2	1461563	5	3
Verified	PRP without proof (not generated)	2018-05-25	GdS	21A3B87C184AEA64	2	1175044	5	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	Proof certified good
2025-09-01	Kriesel	C-PRP	21A3B87C184AEA64 Proof Certified Good Proof Power: 6
2018-05-25	GdS	C-PRP	M1499779/7033963511/38966460233227715737 : 21A3B87C184AEA64
2018-05-24	storm5510	C-PRP	M1499779/7033963511/38966460233227715737 : 21A3B87C184AEA64
2018-05-23	TJAOI	F	Factor: 38966460233227715737
2017-10-29	kkmrkkblmbrbk	C-PRP	M1499779/7033963511 : 6E08BB98B32C4CE3
2017-10-01	Oliver Kruse	C-PRP	M1499779/7033963511 : 6E08BB98B32C4CE3
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12