388 711 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
407995415378802215720629253617	30	98.4	2019-04-14 12:48:51

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	526 / 640

Estimated T-Level: 29.1 ⓘ

TF below 2^92 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	3A1D	0
Verified (Factored)		Michael J. Kilfoyle	A4A17628A3A23A1D	0
Verified (Factored)		Eivind Triel	A4A17628A3A23A1D	85122
Verified (Factored)	2002-11-09	S57483	A4A17628A3A23A1D	241738

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-04-15	artorollo	D8FE6574220D68E0	1	196105	5	3
Verified	2019-04-15	matzetoni	D8FE6574220D68E0	1	352340	5	3
Verified	2019-04-16	marssystems	D8FE6574220D68E0	1	38101	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-04-16	marssystems	C-PRP	M388711/407995415378802215720629253617 : D8FE6574220D68E0 PRP: Verified PRP without proof (small exponent)
2019-04-15	matzetoni	C-PRP	M388711/407995415378802215720629253617 : D8FE6574220D68E0 PRP: Verified PRP without proof (small exponent)
2019-04-15	artorollo	C-PRP	M388711/407995415378802215720629253617 : D8FE6574220D68E0 PRP: Verified PRP without proof (small exponent)
2019-04-14	alex	F-ECM	Factor: 407995415378802215720629253617 / (ECM curve 276, B1=250000, B2=25000000, Sigma=5669517530100899)
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
2011-11-18	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