1 687 177 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
443132267845043807	18	58.6	old
219820914446510278327	21	67.6	2018-02-26 05:04:13

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)		Mark Skidmore	021237EEBDCAFCFB	0
Verified (Factored)	1999-02-07	Christopher G. Lewis	021237EEBDCAFCFB	923647

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-03	Oliver Kruse	367FAC4817EC2624	1	0	1	3
Verified (Factored)	2017-11-03	kkmrkkblmbrbk	367FAC4817EC2624	1	575010	1	3
Verified	2018-02-26	ATH	FBACE84E164BD028	2	1219971	5	3
Verified	2018-02-26	kkmrkkblmbrbk	FBACE84E164BD028	2	628390	5	3

History

Date	User	Type	Result
2018-02-26	kkmrkkblmbrbk	C-PRP	M1687177/443132267845043807/219820914446510278327 : FBACE84E164BD028 PRP: Verified PRP without proof (not generated)
2018-02-26	ATH	C-PRP	M1687177/443132267845043807/219820914446510278327 : FBACE84E164BD028 PRP: Verified PRP without proof (not generated)
2018-02-26	Chang Chia-Tche	F-ECM	Factor: 219820914446510278327 / (ECM curve 1, B1=50000, B2=5000000)
2017-11-03	kkmrkkblmbrbk	C-PRP	M1687177/443132267845043807 : 367FAC4817EC2624 PRP: Verified PRP without proof (not generated)
2017-10-03	Oliver Kruse	C-PRP	M1687177/443132267845043807 : 367FAC4817EC2624 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12