1 621 369 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 3 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
251698233230687	15	47.8	old
364913193478817	15	48.4	2008-08-26 20:19:39
13409942803815075143	20	63.5	2017-03-09 12:22:11

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	Type	Base
Verified (Factored)	2025-09-02	Kriesel	CB3068C41D823804	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-05	Oliver Kruse	688B63E99F2C2274	3	0	1	3
Verified	2017-11-10	kkmrkkblmbrbk	688B63E99F2C2274	3	593271	1	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	CB3068C41D823804 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-11-10	kkmrkkblmbrbk	C-PRP	M1621369/251698233230687/364913193478817/13409942803815075143 : 688B63E99F2C2274 PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1621369/251698233230687/364913193478817/13409942803815075143 : 688B63E99F2C2274 PRP: Verified PRP without proof (not generated)
2017-10-02	Oliver Kruse	C-PRP	M1621369/251698233230687/364913193478817/13409942803815075143 : 688B63E99F2C2274 PRP without proof (not generated)
2017-03-09	TJAOI	F	Factor: 13409942803815075143 / TF: 63-64
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2008-08-26	-Anonymous-	F	Factor: 364913193478817