2 315 771 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
39875862627813918721087	23	75.1	2009-02-07 04:16:50

ECM

Digits	B1	Curves
25	50000	83 / 280

Estimated T-Level: 21.5 ⓘ

TF below 2^66 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Robert Clark	87AB68639CBBB80B	0
Verified (Factored)	1999-03-01	Bruce Mitchell	87AB68639CBBB80B	2138181

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-11	Oliver Kruse	2389A6BE87708AD8	1	0	1	3
Verified	2017-11-23	kkmrkkblmbrbk	2389A6BE87708AD8	1	979028	1	3

History

Date	User	Type	Result
2021-05-07	ViliamF	NF-PM1	B1=5000000, B2=505000000
2018-02-26	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2017-11-23	kkmrkkblmbrbk	C-PRP	M2315771/39875862627813918721087 : 2389A6BE87708AD8 PRP: Verified PRP without proof (not generated)
2017-10-11	Oliver Kruse	C-PRP	M2315771/39875862627813918721087 : 2389A6BE87708AD8 PRP: Verified PRP without proof (not generated)
2009-02-07	axn	F-ECM	Factor: 39875862627813918721087
2009-02-02	axn	NF-PM1	B1=1000000, B2=20000000, E=12
2009-01-17	Sturle Sunde	NF	no factor from 2^60 to 2^61