2 550 139 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
97555096856007708896233	23	76.4	2015-08-09 11:00:07

ECM

Digits	B1	Curves
25	50000	15 / 280

Estimated T-Level: 20.3 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		John Lloyd	64E54974C3C97821	0
Verified (Factored)	1999-05-02	Rick Shank	64E54974C3C97821	2446852

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-14	Oliver Kruse	4599291E223FA784	1	2099055	5	3
Verified	2017-12-01	kkmrkkblmbrbk	4599291E223FA784	1	1184122	5	3

History

Date	User	Type	Result
2022-03-11	LordJulius	NF	no factor from 2^1 to 2^60
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-12-01	kkmrkkblmbrbk	C-PRP	M2550139/97555096856007708896233 : 4599291E223FA784 PRP: Verified PRP without proof (not generated)
2017-10-14	Oliver Kruse	C-PRP	M2550139/97555096856007708896233 : 4599291E223FA784 PRP: Verified PRP without proof (not generated)
2015-08-09	guru	F-ECM	Factor: 97555096856007708896233 / (ECM curve 3, B1=50000, B2=5000000)
2015-02-23	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-23	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-16	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-02-25	James Heinrich	NF-PM1	B1=300000, B2=8000000, E=12
2011-01-09	Joss	NF-PM1	B1=50000
2010-12-19	Joss	NF-PM1	B1=20000
2009-01-31	Sturle Sunde	NF	no factor from 2^60 to 2^61