3 847 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁶

TF target 2⁴⁴

TF below 2^218 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	500000000000
B2 =	5048767708220756520

ECM

Estimated T-Level: 67.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	1900	0
Verified		George Woltman	6A67AEF965E59900	0
Verified		Brian J. Beesley	6A67AEF965E59900	0
Verified	2015-04-11	MadPoo	6A67AEF965E59900	865

History

Date	User	Type	Result
2025-06-20	-Anonymous-	NF-PM1	B1=4000000000000, B2=12016700776795795080
2024-06-17	Ethan O'Connor	NF-PM1	B1=500000000000, B2=5048767708220756520
2023-08-13	masser	NF-PP1	Start=6/5, B1=2410000000, B2=431390000000
2023-07-11	masser	NF-PP1	Start=99/61, B1=2410000000, B2=96400000000
2023-07-08	masser	NF-PM1	B1=72000000000, B2=104876664258065700
2022-03-17	Anton Repko	NF	no factor from 2^65 to 2^66
2021-05-13	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2020-12-13	Anton Repko	NF	no factor from 2^64 to 2^65
2018-06-01	snme2pm1	NF	no factor from 2^63 to 2^64
2016-11-29	snme2pm1	NF	no factor from 2^62 to 2^63
2016-05-14	-Anonymous-	NF-PM1	B1=200000000000, B2=2000000000000, E=12
2016-05-12	-Anonymous-	NF-PM1	B1=100000000000, B2=1000000000000, E=12
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-07-30	snme2pm1	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	6A67AEF965E59900
2015-04-01	mikr	NF-PM1	B1=30000000000, B2=2400000000000, E=12
2015-02-04	Jayder	NF-PM1	B1=3131005715, B2=200384365740, E=12
2012-09-29	bcp19	NF	no factor from 2^60 to 2^61
2011-04-23	Joss	NF-PM1	B1=10000000000
2011-02-06	monst	NF	no factor from 2^58 to 2^60

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