1 901 857 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
12333790737985490321	20	63.4	2015-09-16 11:36:23
251175374825851998427273	24	77.7	2009-07-27 14:20:06

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)		Thomas Honold	C4EA6676ED97ACE5	0
Verified (Factored)	1998-12-27	Kent Lee	C4EA6676ED97ACE5	1307069

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-05	Oliver Kruse	9F69F4CD2FD978F1	2	0	1	3
Verified	2017-11-15	kkmrkkblmbrbk	9F69F4CD2FD978F1	2	1475110	1	3

P-1 factors

Date	Factor	B1	B2
2015-09-16	12333790737985490321	500000	15000000

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2022-03-08	LordJulius	NF	no factor from 2^58 to 2^60
2017-11-15	kkmrkkblmbrbk	C-PRP	M1901857/12333790737985490321/251175374825851998427273 : 9F69F4CD2FD978F1 PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1901857/251175374825851998427273/12333790737985490321 : 9F69F4CD2FD978F1 PRP: Verified PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1901857/251175374825851998427273/12333790737985490321 : 9F69F4CD2FD978F1 PRP without proof (not generated)
2015-09-16	alpertron	F-PM1	Factor: 12333790737985490321 / (P-1, B1=500000, B2=15000000, E=12)
2009-07-27	James Hintz	F-ECM	Factor: 251175374825851998427273
2009-05-24	Architects Cubed	NF	no factor from 2^60 to 2^61