1 678 217 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
11782115516420518727	20	63.4	2013-12-18 22:52:42

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Bruce Loving	E7EFCE526F3B0B29	0
Verified (Factored)	1998-11-21	Ola Svallmark	E7EFCE526F3B0B29	911919

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	2CF0D9BBB7ACBBCB	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	5B2185D18C0C41E5	1	0	1	3
Verified	2017-10-18	Oliver Kruse	5B2185D18C0C41E5	1	1064321	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	2CF0D9BBB7ACBBCB PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2017-10-18	Oliver Kruse	C-PRP	M1678217/11782115516420518727 : 5B2185D18C0C41E5 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1678217/11782115516420518727 : 5B2185D18C0C41E5 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2013-12-18	Chang Chia-Tche	F-ECM	Factor: 11782115516420518727
2012-03-01	Axon	NF-PM1	B1=1000000, B2=20000000, E=12
2012-03-01	Axon	NF-PM1	B1=1000000, B2=8000000, E=12
2012-02-29	Axon	NF-PM1	B1=1000000
2012-02-29	Axon	NF-PM1	B1=900000
2012-02-29	Axon	NF-PM1	B1=800000
2012-02-29	Axon	NF-PM1	B1=700000
2012-02-29	Axon	NF-PM1	B1=600000
2012-02-29	Axon	NF-PM1	B1=500000
2012-02-29	Axon	NF-PM1	B1=400000
2012-02-29	Axon	NF-PM1	B1=300000
2012-02-29	Axon	NF-PM1	B1=200000
2012-02-29	Axon	NF-PM1	B1=100000
2011-01-24	Joss	NF-PM1	B1=50000
2010-09-13	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-27	Architects Cubed	NF	no factor from 2^60 to 2^61

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