4 583 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 2^181 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	3000000000000
B2 =	9003842338903041630

ECM

Estimated T-Level: 56.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	4D6E	0
Verified		George Woltman	EC83698D0915CD6E	0
Verified		Brian J. Beesley	EC83698D0915CD6E	0
Verified	2015-04-11	MadPoo	EC83698D0915CD6E	293

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-02-21	Jason Lynch	factor ECM small	C1S2	0.00 %	2025-02-22

History

Date	User	Type	Result
2025-01-27	-Anonymous-	NF-PM1	B1=3000000000000, B2=9003842338903041630
2024-10-14	timc995	NF-PM1	B1=216000000000, B2=1000335935248800150
2023-08-15	masser	NF-PP1	Start=6/5, B1=1980000000, B2=354420000000
2023-07-10	masser	NF-PP1	Start=151/23, B1=1980000000, B2=79200000000
2023-07-09	masser	NF-PM1	B1=72000000000, B2=84180979543711050
2022-06-12	Anton Repko	NF	no factor from 2^64 to 2^66
2021-12-21	LordJulius	NF-PM1	B1=50000000000, B2=943316046322650
2021-05-12	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2021-02-06	Ruslan Borisov	NF	no factor from 2^64 to 2^65
2018-08-08	snme2pm1	NF	no factor from 2^63 to 2^64
2016-12-02	snme2pm1	NF	no factor from 2^62 to 2^63
2016-05-21	-Anonymous-	NF-PM1	B1=100000000000, B2=1000000000000, E=12
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2016-02-22	mikr	NF-PM1	B1=30000000000, B2=2400000000000, E=12
2015-06-30	Sid & Andy	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	EC83698D0915CD6E
2015-02-11	Jayder	NF-PM1	B1=2560040779, B2=163842609831, E=12
2012-09-29	bcp19	NF	no factor from 2^60 to 2^61
2011-04-29	Joss	NF-PM1	B1=10000000000
2011-02-01	monst	NF	no factor from 2^58 to 2^60

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