173 573 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 2⁶⁶

TF target 2⁴⁴

TF below 2^114 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	156495883
B2 =	9629310190500

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	664 / 4588

Estimated T-Level: 35.7 ⓘ

Status	Date	User	Residue	Shift
Verified		Amdahl 6 - 1989	1301FEA7	0
Verified		Jay R. Hill	46228A289301FEA7	0
Verified		Brian J. Beesley	46228A289301FEA7	0
Verified		Eivind Triel	46228A289301FEA7	27543
Verified	2016-06-01	MadPoo	46228A289301FEA7	14540

History

Date	User	Type	Result
2023-04-26	JacobZ	NF-PM1	B1=156495883, B2=9629310190500
2023-03-12	Joss	NF-PM1	B1=1000000, B2=1108845017280
2023-03-04	masser	NF-PP1	Start=6/5, B1=40000000, B2=1360000000
2023-02-17	masser	NF-PP1	Start=178/47, B1=40000000, B2=1360000000
2023-02-13	masser	NF-PP1	Start=2/7, B1=40000000, B2=1400000000
2023-01-17	Joss	NF-PM1	B1=1000000, B2=106499172780
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2020-01-12	Yxinity	NF	no factor from 2^65 to 2^66
2018-04-22	BloodERazor	NF	no factor from 2^64 to 2^65
2016-06-01	MadPoo	C-LL	46228A289301FEA7
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-22	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-22	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2013-08-24	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2013-08-21	lycorn	NF	no factor from 2^60 to 2^61
2009-01-24	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-21	axn	NF-PM1	B1=5000000, B2=200000000, E=12
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59