185 243 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 =	155365095
B2 =	10773618145290

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	877 / 4588

Estimated T-Level: 36.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Amdahl 6 - 1989	3112D0B8	0
Verified		Laurent Hodges	4609EC7BB112D0B8	0
Verified		Brian J. Beesley	4609EC7BB112D0B8	0
Verified		Eivind Triel	4609EC7BB112D0B8	143398
Verified	2016-06-01	MadPoo	4609EC7BB112D0B8	77877

History

Date	User	Type	Result
2023-04-04	JacobZ	NF-PM1	B1=155365095, B2=10773618145290
2023-02-26	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-14	masser	NF-PP1	Start=126/41, B1=30000000, B2=840000000
2023-02-09	masser	NF-PP1	Start=2/7, B1=30000000, B2=990000000
2023-01-23	Joss	NF-PM1	B1=1000000, B2=74759955270
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-12-10	Gordon Spence	NF	no factor from 2^65 to 2^66
2018-03-03	BloodERazor	NF	no factor from 2^64 to 2^65
2016-06-01	MadPoo	C-LL	4609EC7BB112D0B8
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-10	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-10	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-25	NR	NF	no factor from 2^61 to 2^62
2013-09-27	alpertron	NF-PM1	B1=100000000, B2=2000000000, E=12
2013-08-12	lycorn	NF	no factor from 2^60 to 2^61
2009-01-28	axn	NF-PM1	B1=5000000, B2=200000000, E=12
2009-01-26	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