1 527 899 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 2^81 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10001000
B2 =	45872386560

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		John Lloyd	CF6FDC34590F2029	0
Verified	1998-10-25	Greg Hewgill	CF6FDC34590F2029	429501
Verified	2015-07-21	MadPoo	CF6FDC34590F2029	1249704

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	20FDED07CCE3A884	0	1	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	20FDED07CCE3A884 PRP proof power = 6 PRP: Verified Proof certified good
2025-01-06	Joss	NF-PM1	B1=10001000, B2=45872386560
2023-06-27	Joss	NF-PM1	B1=10001000, B2=17741407320
2023-02-21	Joss	NF-PM1	B1=10001000, B2=3563469000
2022-12-23	Joss	NF-PM1	B1=10001000, B2=1200523170
2018-06-06	ramgeis	NF	no factor from 2^67 to 2^68
2018-03-05	TJAOI	NF	no factor from 2^66 to 2^67
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
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2015-10-06	omylist	NF	no factor from 2^65 to 2^66
2015-07-21	MadPoo	C-LL	CF6FDC34590F2029
2015-03-02	VictordeHollander	NF-PM1	B1=10000000, B2=200000000, E=12
2015-02-04	snme2pm1	NF	no factor from 2^64 to 2^65
2015-02-04	snme2pm1	NF	no factor from 2^63 to 2^64
2013-11-18	David Campeau	NF-PM1	B1=945000, B2=27405000, E=12
2011-01-30	James Heinrich	NF-PM1	B1=80000, B2=1340000, E=6
2010-07-24	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-25	Architects Cubed	NF	no factor from 2^60 to 2^61

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