392 149 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
236855366276480977010683343	27	87.6	2019-04-15 04:24:25

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	281 / 640

Estimated T-Level: 27.2 ⓘ

TF below 2^85 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	4E5A	0
Verified (Factored)		Warwick Harvey	0458607BF9B9CE5A	0
Verified (Factored)		Matt Horbal	0458607BF9B9CE5A	0
Verified (Factored)		Eivind Triel	0458607BF9B9CE5A	172896
Verified (Factored)	2016-06-01	MadPoo	0458607BF9B9CE5A	202562

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-04-15	ATH	1958438F5955A249	1	338996	5	3
Verified	2019-04-16	marssystems	1958438F5955A249	1	172881	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
2019-04-16	marssystems	C-PRP	M392149/236855366276480977010683343 : 1958438F5955A249 PRP: Verified PRP without proof (small exponent)
2019-04-15	ATH	C-PRP	M392149/236855366276480977010683343 : 1958438F5955A249 PRP: Verified PRP without proof (small exponent)
2019-04-15	alex	F-ECM	Factor: 236855366276480977010683343 / (ECM curve 31, B1=250000, B2=25000000, Sigma=4065454288080967)
2018-01-17	BloodERazor	NF	no factor from 2^64 to 2^65
2017-01-19	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2016-06-01	MadPoo	C-LL	0458607BF9B9CE5A
2015-11-18	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-18	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-25	NR	NF	no factor from 2^61 to 2^62
2012-07-12	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2012-01-15	lycorn	NF	no factor from 2^60 to 2^61
2009-01-10	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-29	Sturle Sunde	NF	no factor from 2^58 to 2^59