15 998 743 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
248481930878137911551	21	67.8	2017-01-29 10:15:21

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)	2002-12-09	Nathan Harris	64D34F3B2F1EAB43	7059613
Verified (Factored)	2006-04-28	Alex Hagen	64D34F3B2F1EAB43	2958025

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2023-12-18	Perig	67AE6B90B5CAE914	1	8898330	5	3

History

Date	User	Type	Result
2023-12-18	Jim Donovan	CERT	PRP Certification Proof certified good
2023-12-18	Perig	C-PRP	M15998743/248481930878137911551 : 67AE6B90B5CAE914 PRP proof power = 8 PRP: Verified Proof certified good
2023-11-21	nordi	NF-PM1	B1=480000, B2=265291950
2023-09-17	nordi	NF-PM1	B1=480000
2017-01-29	Conductor	F	Factor: 248481930878137911551 / TF: 67-68
2016-03-16	Mark Rose	NF	no factor from 2^65 to 2^66
2016-02-02	Tha	NF-PM1	B1=300000, B2=6000000, E=12
2014-07-29	Nesowa	NF	no factor from 2^66 to 2^67