2 208 803 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
4417607	7	22.1	old
548812205247036043991	21	68.9	2016-04-16 13:18:03

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	199 / 640

Estimated T-Level: 26.6 ⓘ

TF below 2^83 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-09	Oliver Kruse	6C06B66F29E694C8	2	0	1	3
Verified	2017-11-20	kkmrkkblmbrbk	6C06B66F29E694C8	2	1890954	1	3

P-1 factors

Date	Factor	B1	B2
2016-04-16	548812205247036043991	500000	15000000

History

Date	User	Type	Result
2021-07-03	Dylan Delgado	NF-PM1	B1=2000000, B2=242000000
2021-06-28	Dylan Delgado	NF-PM1	B1=1000000, B2=106000000
2017-11-20	kkmrkkblmbrbk	C-PRP	M2208803/4417607/548812205247036043991 : 6C06B66F29E694C8 PRP: Verified PRP without proof (not generated)
2017-10-09	Oliver Kruse	C-PRP	M2208803/4417607/548812205247036043991 : 6C06B66F29E694C8 PRP: Verified PRP without proof (not generated)
2016-04-16	alpertron	F-PM1	Factor: 548812205247036043991 / (P-1, B1=500000, B2=15000000, E=12)