1 871 449 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
205066814141020507537	21	67.5	2013-10-01 03:57:38

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 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)		Joel Smith	DA9B53B2104571F2	0
Verified (Factored)	1998-12-13	Sam Laur	DA9B53B2104571F2	565164

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-04	Oliver Kruse	0C7FD94182B4458C	1	0	1	3
Verified	2017-11-07	ATH	0C7FD94182B4458C	1	769127	1	3

History

Date	User	Type	Result
2017-11-07	ATH	C-PRP	M1871449/205066814141020507537 : 0C7FD94182B4458C PRP: Verified PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1871449/205066814141020507537 : 0C7FD94182B4458C PRP: Verified PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2013-10-01	Chang Chia-Tche	F-ECM	Factor: 205066814141020507537
2012-01-10	markr	NF-PM1	B1=275000, B2=6000000, E=12
2011-03-08	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-10	Architects Cubed	NF	no factor from 2^60 to 2^61