13 691 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 2^167 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	1000000000000
B2 =	1400138873880026280

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	16550 / 16550
55	110000000	15086 / 40830

Estimated T-Level: 51.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	3410	0
Verified		George Woltman	504A105B03C3B410	0
Verified		Brian J. Beesley	504A105B03C3B410	0
Verified	2015-04-11	MadPoo	504A105B03C3B410	4941

History

Date	User	Type	Result
2023-08-25	masser	NF-PP1	Start=6/5, B1=570000000, B2=102030000000
2023-07-09	masser	NF-PP1	Start=151/37, B1=570000000, B2=22800000000
2022-11-20	-Anonymous-	NF-PM1	B1=1000000000000, B2=1400138873880026280
2022-03-23	-Anonymous-	NF-PM1	B1=100000000000, B2=100013732677278420
2021-11-07	Ruslan Borisov	NF	no factor from 2^65 to 2^66
2021-05-09	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2018-12-03	Anton Repko	NF	no factor from 2^63 to 2^65
2018-10-06	snme2pm1	NF	no factor from 2^63 to 2^64
2018-05-06	James Hintz	NF-PM1	B1=24470561754, B2=1835292131550, E=12
2016-09-23	Sid & Andy	NF	no factor from 2^62 to 2^63
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-08-27	snme2pm1	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	504A105B03C3B410
2013-02-26	bcp19	NF-PM1	B1=10000000000, B2=100000000000, E=12
2012-11-22	bcp19	NF	no factor from 2^60 to 2^61
2012-10-12	Joss	NF-PM1	B1=647218247
2011-05-13	Joss	NF-PM1	B1=400000000
2010-07-04	George Woltman	NF	no factor from 2^59 to 2^60
2010-07-04	George Woltman	NF	no factor from 2^58 to 2^59