847 949 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁸

TF target 2⁴⁴

TF below 2^86 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	35000000
B2 =	9992300037720

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	306 / 640

Estimated T-Level: 27.4 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	2D8	0
Verified		Paul Victor Novarese	0646055AF473A2D8	0
Verified		Joe Decker	0646055AF473A2D8	0
Verified	2015-04-11	MadPoo	0646055AF473A2D8	140905

History

Date	User	Type	Result
2023-12-08	Ethan O'Connor	NF-PM1	B1=35000000, B2=9992300037720
2023-10-20	Joss	NF-PM1	B1=4252576, B2=16626019410
2023-10-17	Joss	NF-PM1	B1=4252576, B2=7896324150
2023-07-12	Joss	NF-PM1	B1=1235317, B2=27825918120
2023-04-17	masser	NF-PP1	Start=6/5, B1=6000000, B2=276000000
2023-03-23	Joss	NF-PM1	B1=1000000, B2=11844518400
2023-03-21	masser	NF-PP1	Start=2/7, B1=6000000, B2=288000000
2023-03-21	masser	NF-PP1	Start=99/71, B1=6000000, B2=276000000
2023-01-12	Joss	NF-PM1	B1=1235317, B2=4637653020
2018-02-21	Smok_bmv	NF	no factor from 2^67 to 2^68
2018-02-21	Smok_bmv	NF	no factor from 2^66 to 2^67
2018-02-21	Smok_bmv	NF	no factor from 2^65 to 2^66
2016-02-05	lycorn	NF	no factor from 2^64 to 2^65
2015-10-03	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-10-03	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-04-11	MadPoo	C-LL	0646055AF473A2D8
2015-02-20	TJAOI	NF	no factor from 2^61 to 2^62
2014-08-08	mikr	NF-PM1	B1=11432362, B2=525888652, E=12
2013-10-28	David Campeau	NF-PM1	B1=1250000, B2=40000000, E=12
2012-03-20	Joss	NF-PM1	B1=1234317
2010-05-27	Architects Cubed	NF	no factor from 2^60 to 2^61
2009-08-29	Carsten Kossendey	NF-PM1	B1=847949
2008-10-13	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-10-13	Sturle Sunde	NF	no factor from 2^58 to 2^59

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