2 143 861 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
32818531531912961	17	54.9	old
33943126713016763746961	23	74.8	2016-03-13 12:08:15

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	168 / 640

Estimated T-Level: 26.3 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-08	Oliver Kruse	4CE984CD2541B7EA	1	0	1	3
Verified	2017-10-17	Oliver Kruse	B8F182600A476AD8	2	1051952	5	3
Verified	2017-11-18	kkmrkkblmbrbk	B8F182600A476AD8	2	1345083	5	3

P-1 factors

Date	Factor	B1	B2
2016-03-13	33943126713016763746961	500000	15000000

History

Date	User	Type	Result
2017-11-18	kkmrkkblmbrbk	C-PRP	M2143861/32818531531912961/33943126713016763746961 : B8F182600A476AD8 PRP: Verified PRP without proof (not generated)
2017-10-17	Oliver Kruse	C-PRP	M2143861/32818531531912961/33943126713016763746961 : B8F182600A476AD8 PRP: Verified PRP without proof (not generated)
2017-10-08	Oliver Kruse	C-PRP	M2143861/32818531531912961/33943126713016763746961 : 4CE984CD2541B7EA PRP: Verified PRP without proof (not generated)
2016-03-13	alpertron	F-PM1	Factor: 33943126713016763746961 / (P-1, B1=500000, B2=15000000, E=12)