1 081 541 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
1932450416295351272647	22	70.7	2017-05-12 11:32:46

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	104 / 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)		Andrew Churchill	74CBC28099058383	0
Verified (Factored)		Bill Daly	74CBC28099058383	0
Verified (Factored)	2003-12-13	Brian J. Beesley	74CBC28099058383	722554
Verified (Factored)	2016-06-01	MadPoo	74CBC28099058383	1009790

PRP

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-01	Kriesel	1F6FA7D9A069013F	0	1	3

PRP Cofactor

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-28	Oliver Kruse	E0526AF9D504EC45	1	0	1	3
Verified	2017-10-16	Oliver Kruse	E0526AF9D504EC45	1	745337	1	3
Verified	2018-01-02	ATH	E0526AF9D504EC45	1	956173	1	3

History

Date	User	Type	Result
2025-09-01	themaanderson	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	1F6FA7D9A069013F PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2018-01-02	ATH	C-PRP	M1081541/1932450416295351272647 : E0526AF9D504EC45 PRP: Verified PRP without proof (not generated)
2017-10-16	Oliver Kruse	C-PRP	M1081541/1932450416295351272647 : E0526AF9D504EC45 PRP: Verified PRP without proof (not generated)
2017-09-28	Oliver Kruse	C-PRP	M1081541/1932450416295351272647 : E0526AF9D504EC45 PRP: Verified PRP without proof (not generated)
2017-05-12	TJAOI	F-ECM	Factor: 1932450416295351272647 / (ECM curve 31, B1=50000, B2=5000000)
2016-06-01	MadPoo	C-LL	74CBC28099058383
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^60
2014-11-24	BloodIce	NF-PM1	B1=5000000, B2=100000000, E=12
2014-11-24	BloodIce	NF-PM1	B1=1000000
2014-11-06	Joss	NF-PM1	B1=318690
2014-08-21	Joss	NF-PM1	B1=259345
2014-04-01	Never Odd Or Even	NF	no factor from 2^70 to 2^71
2014-02-22	Never Odd Or Even	NF	no factor from 2^69 to 2^70
2014-02-22	Never Odd Or Even	NF	no factor from 2^68 to 2^69
2014-02-22	Never Odd Or Even	NF	no factor from 2^67 to 2^68
2014-02-22	Never Odd Or Even	NF	no factor from 2^66 to 2^67
2014-02-22	Never Odd Or Even	NF	no factor from 2^65 to 2^66
2014-02-03	lycorn	NF	no factor from 2^64 to 2^65
2014-02-02	lycorn	NF	no factor from 2^63 to 2^64
2012-10-18	dbaugh	NF	no factor from 2^62 to 2^63
2012-02-06	bcp19	NF-PM1	B1=200000, B2=100000000, E=12
2012-01-04	bcp19	NF-PM1	B1=200000, B2=10000000, E=12
2010-11-16	Michael C	NF	no factor from 2^61 to 2^62
2009-02-25	Sturle Sunde	NF	no factor from 2^60 to 2^61

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