13 879 109 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
42708472405185609762601159	26	85.1	2016-09-19 07:30:55

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

TF below 2^61 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2002-03-24	Frade	DDA1AEBF11112514	8010427
Verified (Factored)	2005-04-11	John Andrews	DDA1AEBF11112514	1039071

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2022-10-28	Perig	422574F8FFA1ABC7	1	8333290	5	3

History

Date	User	Type	Result
2023-11-03	nordi	NF-PM1	B1=500000, B2=320708850
2023-10-26	nordi	NF-PM1	B1=500000
2022-10-28	Massimo Cappelli (ik5pwa)	CERT	PRP Certification Proof certified good
2022-10-28	Perig	C-PRP	M13879109/42708472405185609762601159 : 422574F8FFA1ABC7 PRP proof power = 8 PRP: Verified Proof certified good
2016-09-19	fireredd	F-ECM	Factor: 42708472405185609762601159 / (ECM curve 1, B1=50000, B2=5000000)
2015-09-06	Nesowa	NF	no factor from 2^66 to 2^67
2014-07-08	Nesowa	NF	no factor from 2^65 to 2^66