395 147 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
5017029642482889547505126563508264647	37	121.9	2019-04-15 10:08:15

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	492 / 640

Estimated T-Level: 28.8 ⓘ

TF below 2^91 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	D27	0
Verified (Factored)		Bo Asklund	D0F948CEC4DD0D27	0
Verified (Factored)		Klaus Kastens	D0F948CEC4DD0D27	0
Verified (Factored)		Eivind Triel	D0F948CEC4DD0D27	24356
Verified (Factored)	2016-06-01	MadPoo	D0F948CEC4DD0D27	322939

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-04-16	M8909387	E0D7E436C4535BC6	1	334585	5	3
Verified	2019-04-16	matzetoni	E0D7E436C4535BC6	1	68253	5	3
Verified	2019-04-20	Brett Walker	E0D7E436C4535BC6	1	379012	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-04-30	Gordon Spence	NF	no factor from 2^65 to 2^66
2019-04-20	Brett Walker	C-PRP	M395147/5017029642482889547505126563508264647 : E0D7E436C4535BC6 PRP: Verified PRP without proof (small exponent)
2019-04-16	matzetoni	C-PRP	M395147/5017029642482889547505126563508264647 : E0D7E436C4535BC6 PRP: Verified PRP without proof (small exponent)
2019-04-16	M8909387	C-PRP	M395147/5017029642482889547505126563508264647 : E0D7E436C4535BC6 PRP: Verified PRP without proof (small exponent)
2019-04-15	alex	F-ECM	Factor: 5017029642482889547505126563508264647 / (ECM curve 74, B1=250000, B2=25000000, Sigma=483045716200968)
2018-01-18	BloodERazor	NF	no factor from 2^64 to 2^65
2017-01-24	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2016-06-01	MadPoo	C-LL	D0F948CEC4DD0D27
2015-11-19	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-19	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-25	NR	NF	no factor from 2^61 to 2^62
2012-07-05	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2011-02-27	monst	NF	no factor from 2^60 to 2^61
2009-01-27	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-05	Sturle Sunde	NF	no factor from 2^58 to 2^59