639 049 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁹

TF target 2⁴⁴

TF below 2^89 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	51000000
B2 =	728120893500

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	436 / 640

Estimated T-Level: 28.4 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	C31	0
Verified		Herb Savage	DAC90FF0F1444C31	0
Verified	2002-08-03	Gordon M. Spence	DAC90FF0F1444C31	611861
Verified	2015-04-11	MadPoo	DAC90FF0F1444C31	488492

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-07-07	-Anonymous-	factor ECM small		0.00 %	2025-09-15
2025-05-29	-Anonymous-	factor ECM small		0.00 %	2025-08-22

History

Date	User	Type	Result
2023-10-03	masser	NF-PP1	Start=84/61, B1=10000000, B2=790000000
2023-09-21	masser	NF-PP1	Start=6/5, B1=10000000, B2=790000000
2022-10-07	masser	NF-PM1	B1=51000000, B2=728120893500
2022-09-15	masser	NF-PM1	B1=51000000
2022-08-31	masser	NF-PP1	Start=2/7, B1=5100000, B2=219300000
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-02-18	Smok_bmv	NF	no factor from 2^68 to 2^69
2019-02-18	Smok_bmv	NF	no factor from 2^67 to 2^68
2019-02-18	Smok_bmv	NF	no factor from 2^66 to 2^67
2017-07-24	Smok_bmv	NF	no factor from 2^65 to 2^66
2017-06-26	Smok_bmv	NF	no factor from 2^64 to 2^65
2015-11-14	Sid & Andy	NF-PM1	B1=6390490, B2=191714700, E=12
2015-10-15	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-10-15	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-06-02	lycorn	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	DAC90FF0F1444C31
2012-11-29	SRJ2877	NF-PM1	B1=3000000, B2=60000000, E=12
2012-08-04	Joss	NF-PM1	B1=1278098
2012-06-19	Joss	NF-PM1	B1=639167
2011-09-05	Joss	NF-PM1	B1=593710
2011-07-10	Joss	NF-PM1	B1=356226
2011-01-29	Sid & Andy	NF	no factor from 2^60 to 2^61
2008-10-10	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-10-10	Sturle Sunde	NF	no factor from 2^58 to 2^59

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