1 521 769 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
71158028933598788927	20	65.9	2013-08-08 12:54:46

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1997-11-12	Herb Savage	2DED58822956EDA7	0
Verified (Factored)	1999-02-14	Florin Clapa	2DED58822956EDA7	1101034

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-01	Oliver Kruse	791B2F4D1C282B20	1	0	1	3
Verified	2017-10-29	kkmrkkblmbrbk	791B2F4D1C282B20	1	13793	1	3

History

Date	User	Type	Result
2017-10-29	kkmrkkblmbrbk	C-PRP	M1521769/71158028933598788927 : 791B2F4D1C282B20 PRP: Verified PRP without proof (not generated)
2017-10-01	Oliver Kruse	C-PRP	M1521769/71158028933598788927 : 791B2F4D1C282B20 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2013-08-08	Chang Chia-Tche	F-ECM	Factor: 71158028933598788927
2011-01-29	James Heinrich	NF-PM1	B1=80000, B2=1340000, E=6
2010-05-04	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-25	Architects Cubed	NF	no factor from 2^60 to 2^61