771 301 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 2^87 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	71853000
B2 =	3838083519270

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	338 / 640

Estimated T-Level: 27.6 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	186B	0
Verified		Vincent Renardias	49C7D762A6B6D86B	0
Verified	2002-10-26	Mark Outhier	49C7D762A6B6D86B	387836
Verified	2015-04-11	MadPoo	49C7D762A6B6D86B	341987

History

Date	User	Type	Result
2025-06-19	Jason Lynch	NF-PM1	B1=71853000, B2=3838083519270
2024-06-13	Joss	NF-PM1	B1=10000000, B2=113119406400
2024-01-21	Joss	NF-PM1	B1=8833652, B2=22305383100
2023-11-07	Joss	NF-PM1	B1=4416826, B2=8354753550
2023-07-30	Joss	NF-PM1	B1=2318500, B2=46916469600
2023-04-29	masser	NF-PP1	Start=6/5, B1=6000000, B2=276000000
2023-04-04	masser	NF-PP1	Start=2/7, B1=6000000, B2=282000000
2023-04-03	masser	NF-PP1	Start=141/11, B1=6000000, B2=276000000
2023-03-15	Joss	NF-PM1	B1=1000000, B2=13912959060
2022-11-23	Joss	NF-PM1	B1=2318500, B2=4929814890
2022-03-12	Gordon Spence	NF	no factor from 2^67 to 2^68
2020-04-03	Yxinity	NF	no factor from 2^66 to 2^67
2018-03-04	Smok_bmv	NF	no factor from 2^65 to 2^66
2016-03-19	lycorn	NF	no factor from 2^64 to 2^65
2015-11-21	Sid & Andy	NF-PM1	B1=7713010, B2=231390300, E=12
2015-10-22	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-10-22	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-04-11	MadPoo	C-LL	49C7D762A6B6D86B
2015-03-06	NR	NF	no factor from 2^61 to 2^62
2013-10-26	David Campeau	NF-PM1	B1=1545000, B2=52530000, E=12
2012-07-21	Joss	NF-PM1	B1=1542602
2011-12-10	Joss	NF-PM1	B1=930433
2011-08-24	Joss	NF-PM1	B1=465216
2011-07-10	Joss	NF-PM1	B1=279130
2010-06-05	Architects Cubed	NF	no factor from 2^60 to 2^61
2008-10-11	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-10-11	Sturle Sunde	NF	no factor from 2^58 to 2^59

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