2 406 289 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
202315966543	12	37.6	old
21276075270119	14	44.3	2008-09-30 14:36:59
255079289530562072671	21	67.8	2018-02-18 11:12:12

ECM

Digits	B1	Curves
25	50000	152 / 280

Estimated T-Level: 22.7 ⓘ

TF below 2^70 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-13	Oliver Kruse	64851DE2D057E518	2	1704825	5	3
Verified (Factored)	2017-11-26	kkmrkkblmbrbk	64851DE2D057E518	2	1004310	5	3
Verified	2018-02-20	Oliver Kruse	64851DE2D057E518	3	370800	5	3

History

Date	User	Type	Result
2018-09-28	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2018-02-20	Oliver Kruse	C-PRP	M2406289/202315966543/21276075270119/255079289530562072671 : 64851DE2D057E518 PRP: Verified PRP without proof (not generated)
2018-02-18	ATH	F-ECM	Factor: 255079289530562072671 / (ECM curve 2, B1=50000, B2=5000000)
2017-11-26	kkmrkkblmbrbk	C-PRP	M2406289/202315966543/21276075270119 : 64851DE2D057E518 PRP: Verified PRP without proof (not generated)
2017-10-13	Oliver Kruse	C-PRP	M2406289/202315966543/21276075270119 : 64851DE2D057E518 PRP: Verified PRP without proof (not generated)
2008-09-30	markr	F	Factor: 21276075270119