8 780 909 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
21165555185016923421123673	26	84.1	2013-11-01 01:04:59

ECM

Digits	B1	Curves
25	50000	3 / 280

Estimated T-Level: 20.1 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)	2000-03-01	Martin Fahlgren	4B19847DC018FFEA	4899507
Verified (Factored)	2003-01-25	Donald Rober	4B19847DC018FFEA	1870421

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-01-21	oodaira	DC25F4301E495B8F	1	2951227	5	3
Verified	2020-09-05	kutens	DC25F4301E495B8F	1	4495071	5	3

History

Date	User	Type	Result
2020-09-05	kutens	C-PRP	M8780909/21165555185016923421123673 : DC25F4301E495B8F PRP: Verified PRP without proof (not generated)
2019-01-21	oodaira	C-PRP	M8780909/21165555185016923421123673 : DC25F4301E495B8F PRP: Verified PRP without proof (not generated)
2013-11-01	sannerud.com	F-ECM	Factor: 21165555185016923421123673
2012-06-29	James Heinrich	NF-PM1	B1=165000, B2=3547500, E=6