1 999 603 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
131973799	9	27.0	old
122876388715570890273953	24	76.7	2015-10-13 11:27:57

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	82 / 640

Estimated T-Level: 25.6 ⓘ

TF below 2^80 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-05	Oliver Kruse	B1C9CCA39F7AB2C0	2	0	1	3
Verified	2017-11-13	kkmrkkblmbrbk	B1C9CCA39F7AB2C0	2	509318	1	3

P-1 factors

Date	Factor	B1	B2
2015-10-13	122876388715570890273953	500000	15000000

History

Date	User	Type	Result
2017-11-13	kkmrkkblmbrbk	C-PRP	M1999603/131973799/122876388715570890273953 : B1C9CCA39F7AB2C0 PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1999603/131973799/122876388715570890273953 : B1C9CCA39F7AB2C0 PRP: Verified PRP without proof (not generated)
2015-10-13	alpertron	F-PM1	Factor: 122876388715570890273953 / (P-1, B1=500000, B2=15000000, E=12)