2 981 533 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
50178704961948907856999	23	75.4	2016-01-10 22:50:23

ECM

Digits	B1	Curves
25	50000	10 / 280

Estimated T-Level: 20.2 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		Don Kersey	A430099B3DA46C6D	0
Verified (Factored)	1999-08-16	Mark Nieman	A430099B3DA46C6D	457130

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	9C04AF7DC1B0A739	1	0	1	3
Verified	2017-11-18	Oliver Kruse	9C04AF7DC1B0A739	1	1550285	1	3

History

Date	User	Type	Result
2023-02-28	USAFSS	NF-PM1	B1=320000, B2=243437040
2017-11-18	Oliver Kruse	C-PRP	M2981533/50178704961948907856999 : 9C04AF7DC1B0A739 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M2981533/50178704961948907856999 : 9C04AF7DC1B0A739 PRP: Verified PRP without proof (not generated)
2016-01-10	bam	F-ECM	Factor: 50178704961948907856999 / (ECM curve 1, B1=50000, B2=5000000)
2015-04-13	lycorn	NF	no factor from 2^64 to 2^65
2015-04-13	lycorn	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-11-25	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-10-25	markr	NF-PM1	B1=95000, B2=1995000, E=6
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61