1 123 699 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
415993686683119	15	48.6	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 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	Type	Base
Verified (Factored)	2025-09-01	Kriesel	B04D3EDD0B2F0474	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-29	Oliver Kruse	60CA9C201B38DBF5	1	0	1	3
Verified	2017-10-16	Oliver Kruse	60CA9C201B38DBF5	1	259456	1	3
Verified	2018-01-02	ATH	60CA9C201B38DBF5	1	564407	1	3

History

Date	User	Type	Result
2025-09-02	Shaffer	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	B04D3EDD0B2F0474 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2025-01-05	yuriy_5-1	NF-PM1	B1=191000, B2=2857974210
2018-01-02	ATH	C-PRP	M1123699/415993686683119 : 60CA9C201B38DBF5 PRP: Verified PRP without proof (not generated)
2017-10-16	Oliver Kruse	C-PRP	M1123699/415993686683119 : 60CA9C201B38DBF5 PRP: Verified PRP without proof (not generated)
2017-09-29	Oliver Kruse	C-PRP	M1123699/415993686683119 : 60CA9C201B38DBF5 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=300000, B2=10000000, E=12