388 699 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
471200439608977915096150481351767	33	108.5	2019-04-14 07:44:32

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	456 / 640

Estimated T-Level: 28.6 ⓘ

TF below 2^90 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	19AF	0
Verified (Factored)		Michael J. Kilfoyle	8CCD3D09CEA719AF	0
Verified (Factored)		Eivind Triel	8CCD3D09CEA719AF	151072
Verified (Factored)	2002-11-09	S57483	8CCD3D09CEA719AF	143030

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-04-15	artorollo	F91EAD6018A5BC18	1	367686	5	3
Verified	2019-04-15	matzetoni	F91EAD6018A5BC18	1	119621	5	3
Verified	2019-04-16	kkmrkkblmbrbk	F91EAD6018A5BC18	1	156464	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-04-16	kkmrkkblmbrbk	C-PRP	M388699/471200439608977915096150481351767 : F91EAD6018A5BC18 PRP: Verified PRP without proof (small exponent)
2019-04-15	matzetoni	C-PRP	M388699/471200439608977915096150481351767 : F91EAD6018A5BC18 PRP: Verified PRP without proof (small exponent)
2019-04-15	artorollo	C-PRP	M388699/471200439608977915096150481351767 : F91EAD6018A5BC18 PRP: Verified PRP without proof (small exponent)
2019-04-14	alex	F-ECM	Factor: 471200439608977915096150481351767 / (ECM curve 206, B1=250000, B2=25000000, Sigma=8813884066161941)
2018-01-31	BloodERazor	NF	no factor from 2^64 to 2^65
2017-01-16	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2015-11-28	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-28	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2012-07-30	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2011-11-19	lycorn	NF	no factor from 2^60 to 2^61
2009-01-08	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59