1 705 897 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with both PRP and Lucas-Lehmer tests

No factors below 2⁶⁸

TF target 2⁶¹

TF below 2^82 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	17000000
B2 =	280483863660

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	141 / 640

Estimated T-Level: 26.1 ⓘ

Status	Date	User	Residue	Shift
Verified		Scott Kurowski	CA195B8F9065AD5C	0
Verified	1998-11-21	Martijn Otto	CA195B8F9065AD5C	1271799
Verified	2015-07-03	MadPoo	CA195B8F9065AD5C	616588

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	1777E28E84777ACD	0	1	3

History

Date	User	Type	Result
2025-09-03	Will K	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	1777E28E84777ACD PRP proof power = 6 PRP: Verified Proof certified good
2023-06-12	linament	NF-PM1	B1=17000000, B2=280483863660
2023-06-12	linament	NF-PM1	B1=17000000
2023-03-13	Joss	NF-PM1	B1=10000000, B2=3535614810
2023-01-03	Joss	NF-PM1	B1=10000000, B2=1277506230
2021-05-04	Carlos Pinho	NF-PP1	Start=2/7, B1=1000000, B2=51000000
2019-07-24	TJAOI	NF	no factor from 2^67 to 2^68
2018-06-18	TJAOI	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-08-31	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-03	MadPoo	C-LL	CA195B8F9065AD5C
2015-02-18	VictordeHollander	NF-PM1	B1=10000000, B2=200000000, E=12
2015-02-13	Joss	NF-PM1	B1=374591
2015-02-13	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-13	VictordeHollander	NF	no factor from 2^63 to 2^64
2015-01-07	Joss	NF-PM1	B1=281437
2014-10-03	Joss	NF-PM1	B1=187625
2014-04-28	-Anonymous-	NF-PM1	B1=150000
2014-03-31	Joss	NF-PM1	B1=100000
2011-02-10	Carsten Kossendey	NF-PM1	B1=90000, B2=1507500, E=6
2011-01-29	Joss	NF-PM1	B1=50000
2010-10-16	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-21	Architects Cubed	NF	no factor from 2^60 to 2^61

Username
Password