8 851 319 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
3929986617993600972887	22	71.7	2012-09-08 04:17:22

ECM

Digits	B1	Curves
25	50000	16 / 280

Estimated T-Level: 20.3 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2000-03-15	Alan Vidmar	1646029E53B4AAC4	150981
Verified (Factored)	2003-02-02	Niklas Lithammer	1646029E53B4AAC4	1085814

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-02-25	Cubox	143E5F5A71EB5E60	1	7148684	5	3
Verified	2020-09-15	Poao	143E5F5A71EB5E60	1	3682038	5	3

P-1 factors

Date	Factor	B1	B2
2012-09-08	3929986617993600972887	105000	1916250

History

Date	User	Type	Result
2021-05-12	firejuggler	NF-PP1	Start=6/5, B1=500000, B2=24500000
2021-05-06	firejuggler	NF-PP1	Start=2/7, B1=500000, B2=24500000
2020-09-15	Poao	C-PRP	M8851319/3929986617993600972887 : 143E5F5A71EB5E60 PRP: Verified PRP without proof (not generated)
2019-02-25	Cubox	C-PRP	M8851319/3929986617993600972887 : 143E5F5A71EB5E60 PRP: Verified PRP without proof (not generated)
2012-09-08	firejuggler	F-PM1	Factor: 3929986617993600972887