15 491 027 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
38658809825964866849191	23	75.0	2016-12-18 21:29:04

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)	2004-05-25	Chris Halsall	1FFD8BC6143ADA56	2710379
Verified (Factored)	2005-11-27	Alan Hamilton	1FFD8BC6143ADA56	9835093

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2023-08-09	Perig	6708BF3AFE43761B	1	3156056	5	3

History

Date	User	Type	Result
2023-11-05	nordi	NF-PM1	B1=496000, B2=530595450
2023-10-23	nordi	NF-PM1	B1=496000
2023-08-09	Perig	CERT	PRP Certification Proof certified good
2023-08-09	Perig	C-PRP	M15491027/38658809825964866849191 : 6708BF3AFE43761B PRP proof power = 8 PRP: Verified Proof certified good
2016-12-18	bam	F-ECM	Factor: 38658809825964866849191 / (ECM curve 1, B1=50000, B2=5000000)
2014-02-23	Nesowa	NF	no factor from 2^66 to 2^67
2014-02-23	Nesowa	NF	no factor from 2^65 to 2^66