1 984 183 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
2066195750027354602529	22	70.8	2015-06-23 08:49:18

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	58 / 640

Estimated T-Level: 25.5 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		Luke Welsh	8CF177F9A3EFEB9D	0
Verified (Factored)	1999-01-17	Mike Larkin	8CF177F9A3EFEB9D	1344011

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	66558944257265C8	1	0	1	3
Verified	2017-10-20	Oliver Kruse	66558944257265C8	1	1491944	1	3

History

Date	User	Type	Result
2017-10-20	Oliver Kruse	C-PRP	M1984183/2066195750027354602529 : 66558944257265C8 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1984183/2066195750027354602529 : 66558944257265C8 PRP: Verified PRP without proof (not generated)
2015-06-23	guru	F-ECM	Factor: 2066195750027354602529 / (ECM curve 3, B1=50000, B2=5000000)
2015-03-13	lycorn	NF	no factor from 2^64 to 2^65
2015-03-13	lycorn	NF	no factor from 2^63 to 2^64
2011-07-01	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-01-22	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2009-12-16	S485122	NF	no factor from 2^60 to 2^61