338 747 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
15851992167624447524652010337	29	93.7	2019-03-25 23:54:22

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	320 / 640

Estimated T-Level: 27.5 ⓘ

TF below 2^86 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	35B5	0
Verified (Factored)		Unknown	75B5	0
Verified (Factored)		Guillermo Ballester Valor	1AB78A0ADF33F5B5	0
Verified (Factored)		Eivind Triel	1AB78A0ADF33F5B5	218348
Verified (Factored)	2002-01-15	Dennis Pope	1AB78A0ADF33F5B5	16738

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-03-26	ANONYMOUS	E1EECE4D4DC0BF10	1	242467	5	3
Verified	2019-03-26	EthanD	E1EECE4D4DC0BF10	1	255905	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2021-06-22	George Woltman	NF-PP1	Start=2/7, B1=30000000, B2=3060000000
2019-03-26	EthanD	C-PRP	M338747/15851992167624447524652010337 : E1EECE4D4DC0BF10 PRP: Verified PRP without proof (small exponent)
2019-03-26	ANONYMOUS	C-PRP	M338747/15851992167624447524652010337 : E1EECE4D4DC0BF10 PRP: Verified PRP without proof (small exponent)
2019-03-25	alex	F-ECM	Factor: 15851992167624447524652010337 / (ECM curve 17, B1=250000, B2=25000000, Sigma=5838893394162277)
2018-01-27	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-08-31	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2015-12-15	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-12-15	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-07-25	NR	NF	no factor from 2^61 to 2^62
2013-05-15	Sid & Andy	NF	no factor from 2^60 to 2^61
2012-02-02	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2011-08-09	Joss	NF-PM1	B1=1352052
2009-01-26	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-30	Sturle Sunde	NF	no factor from 2^58 to 2^59