1 719 857 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
125664720949900007424100319	27	86.7	2014-10-25 21:21:34
1864167629521559028113997383	28	90.6	2015-06-06 12:14:35

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)		Pam Generie	AEC1C83AF7FF21C2	0
Verified (Factored)	1999-01-02	Jörg Thomsen	AEC1C83AF7FF21C2	1710862

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	7CF7F1272E39C34B	2	0	1	3
Verified	2017-10-19	Oliver Kruse	7CF7F1272E39C34B	2	795953	1	3

P-1 factors

Date	Factor	B1	B2
2015-06-06	1864167629521559028113997383	500000	15000000

History

Date	User	Type	Result
2017-10-19	Oliver Kruse	C-PRP	M1719857/125664720949900007424100319/1864167629521559028113997383 : 7CF7F1272E39C34B PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1719857/125664720949900007424100319/1864167629521559028113997383 : 7CF7F1272E39C34B PRP: Verified PRP without proof (not generated)
2015-06-06	alpertron	F-PM1	Factor: 1864167629521559028113997383 / (P-1, B1=500000, B2=15000000, E=12)
2014-10-25	Chang Chia-Tche	F-ECM	Factor: 125664720949900007424100319 / (ECM curve 2, B1=50000, B2=5000000)
2014-10-06	Joss	NF-PM1	B1=187319
2014-05-03	Joss	NF-PM1	B1=150000
2014-04-04	Joss	NF-PM1	B1=100000
2011-02-07	Carsten Kossendey	NF-PM1	B1=90000, B2=1507500, E=6
2010-10-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-24	Architects Cubed	NF	no factor from 2^60 to 2^61