386 887 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

TF

No factors below 2⁶⁸

TF target 2⁴⁴

TF below 2^101 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	73000000
B2 =	2103141080040

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	635 / 1566

Estimated T-Level: 32.0 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	360C	0
Verified		Marc Honey	185A48C6331F360C	0
Verified		Eivind Triel	185A48C6331F360C	120573
Verified	2002-11-09	S57483	185A48C6331F360C	49134

History

Date	User	Type	Result
2023-07-31	JacobZ	NF-PM1	B1=73000000, B2=2103141080040
2023-07-20	Joss	NF-PM1	B1=1000000, B2=68245727550
2023-02-06	Joss	NF-PM1	B1=1000000, B2=28509731250
2023-01-04	masser	NF-PP1	Start=6/5, B1=20000000, B2=640000000
2022-12-27	masser	NF-PP1	Start=2/7, B1=20000000, B2=640000000
2022-12-26	masser	NF-PP1	Start=143/13, B1=20000000, B2=620000000
2022-12-04	Gordon Spence	NF	no factor from 2^67 to 2^68
2022-03-13	Yxinity	NF	no factor from 2^66 to 2^67
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-05-21	Gordon Spence	NF	no factor from 2^65 to 2^66
2018-02-01	BloodERazor	NF	no factor from 2^64 to 2^65
2017-01-13	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2015-11-25	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-25	Gordon Spence	NF	no factor from 2^62 to 2^63
2012-12-01	dbaugh	NF	no factor from 2^61 to 2^62
2012-11-27	dbaugh	NF	no factor from 2^60 to 2^61
2012-07-25	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2009-01-09	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-06	Sturle Sunde	NF	no factor from 2^58 to 2^59