1 618 537 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
9824839603898567	16	53.1	old
3450062954765246474279	22	71.5	2019-10-07 13:18:48

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	6FB8C2FACED68C37	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-02	Oliver Kruse	22191E1A3B2A8517	1	0	1	3
Verified (Factored)	2017-11-01	kkmrkkblmbrbk	22191E1A3B2A8517	1	31494	1	3
Verified	2019-10-08	mnd9	6FB8C2FACED68C37	2	677940	5	3
Verified	2019-10-11	GAN	6FB8C2FACED68C37	2	383309	5	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	6FB8C2FACED68C37 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2019-10-11	GAN	C-PRP	M1618537/9824839603898567/3450062954765246474279 : 6FB8C2FACED68C37 PRP: Verified PRP without proof (not generated)
2019-10-08	mnd9	C-PRP	M1618537/9824839603898567/3450062954765246474279 : 6FB8C2FACED68C37 PRP: Verified PRP without proof (not generated)
2019-10-07	TJAOI	F-ECM	Factor: 3450062954765246474279 / (ECM curve 32, B1=50000, B2=5000000)
2017-11-01	kkmrkkblmbrbk	C-PRP	M1618537/9824839603898567 : 22191E1A3B2A8517 PRP: Verified PRP without proof (not generated)
2017-10-02	Oliver Kruse	C-PRP	M1618537/9824839603898567 : 22191E1A3B2A8517 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12