4 205 581 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
25233487	8	24.6	old
139424825452904957087	21	66.9	2018-12-13 22:26:20

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

TF below 2^61 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-11-15	kkmrkkblmbrbk	570009AD2A63E6C4	1	375249	5	3
Verified (Factored)	2018-01-20	Oliver Kruse	570009AD2A63E6C4	1	4121313	5	3
Verified	2018-12-14	Oliver Kruse	570009AD2A63E6C4	2	1155892	5	3

History

Date	User	Type	Result
2022-09-19	USAFSS	NF-PM1	B1=340000, B2=243418890
2018-12-14	Oliver Kruse	C-PRP	M4205581/25233487/139424825452904957087 : 570009AD2A63E6C4 PRP: Verified PRP without proof (not generated)
2018-12-13	ATH	F-ECM	Factor: 139424825452904957087 / (ECM curve 1, B1=50000, B2=5000000)
2018-01-20	Oliver Kruse	C-PRP	M4205581/25233487 : 570009AD2A63E6C4 PRP: Verified PRP without proof (not generated)
2017-11-15	kkmrkkblmbrbk	C-PRP	M4205581/25233487 : 570009AD2A63E6C4 PRP: Verified PRP without proof (not generated)