880 823 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
190840209999502237913887	24	77.3	2015-05-02 01:17:30

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 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)		David Slowinski	3E2F	0
Verified (Factored)		Greg McArthur	4F486EB476453E2F	0
Verified (Factored)	2002-01-28	Marc Getty / Phil Fizur	4F486EB476453E2F	776345
Verified (Factored)	2015-04-11	MadPoo	4F486EB476453E2F	184070

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-28	Oliver Kruse	7E63477E20AF7786	1	0	1	3
Verified	2017-10-15	kkmrkkblmbrbk	7E63477E20AF7786	1	618247	1	3
Unverified (Reliable)	2020-04-22	Oliver Kruse	23F9E8C6068E46__	1	245342	5	3

P-1 factors

Date	Factor	B1	B2
2015-05-02	190840209999502237913887	12358775	568503660

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^58 to 2^59
2020-04-22	Oliver Kruse	C-PRP	M880823/190840209999502237913887 : 23F9E8C6068E46__ PRP: Unverified (Reliable) PRP without proof (small exponent)
2017-10-15	kkmrkkblmbrbk	C-PRP	M880823/190840209999502237913887 : 7E63477E20AF7786 PRP: Unverified (Reliable) PRP without proof (small exponent)
2017-09-28	Oliver Kruse	C-PRP	M880823/190840209999502237913887 : 7E63477E20AF7786 PRP: Unverified (Reliable) PRP without proof (not generated)
2015-05-02	mikr	F-PM1	Factor: 190840209999502237913887
2015-05-01	Joss	NF-PM1	B1=2531592
2015-04-11	MadPoo	C-LL	4F486EB476453E2F
2015-04-08	Joss	NF-PM1	B1=2092226
2014-09-21	lycorn	NF	no factor from 2^61 to 2^62
2012-10-25	Joss	NF-PM1	B1=1902024
2012-09-21	Joss	NF-PM1	B1=1761646
2012-04-16	Joss	NF-PM1	B1=1174920
2012-02-06	Joss	NF-PM1	B1=783280
2011-09-05	Joss	NF-PM1	B1=391640
2011-07-12	Joss	NF-PM1	B1=234984
2011-02-24	Joss	NF-PM1	B1=200000
2010-05-22	Architects Cubed	NF	no factor from 2^60 to 2^61