2 781 007 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
186692164722774907481	21	67.3	2019-02-24 11:40:40

ECM

Digits	B1	Curves
25	50000	125 / 280

Estimated T-Level: 22.2 ⓘ

TF below 2^69 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Bad	1997-11-11	David Leung	F3E2D59FF092685B	0
Verified (Factored)	1999-05-16	Paul Heuwinkel	9A5A1D1B04710530	0
Verified (Factored)	2000-04-05	David Campeau	9A5A1D1B04710530	2017340
Verified (Factored)	2018-08-25	kkmrkkblmbrbk	9A5A1D1B04710530	2209014

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-02-24	ATH	6A0B99C0103B82A4	1	990575	5	3
Verified	2019-02-24	kkmrkkblmbrbk	6A0B99C0103B82A4	1	2676527	5	3
Verified	2019-03-15	alex	6A0B99C0103B82A4	1	1858289	5	3

History

Date	User	Type	Result
2019-03-15	alex	C-PRP	M2781007/186692164722774907481 : 6A0B99C0103B82A4 PRP: Verified PRP without proof (not generated)
2019-02-24	kkmrkkblmbrbk	C-PRP	M2781007/186692164722774907481 : 6A0B99C0103B82A4 PRP: Verified PRP without proof (not generated)
2019-02-24	ATH	C-PRP	M2781007/186692164722774907481 : 6A0B99C0103B82A4 PRP: Verified PRP without proof (not generated)
2019-02-24	chuenkit	F	Factor: 186692164722774907481 / TF: 67-68
2018-08-25	kkmrkkblmbrbk	C-LL	9A5A1D1B04710530
2017-10-16	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-03	mikr	NF-PM1	B1=2700000, B2=84000000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-12-20	omylist	NF	no factor from 2^65 to 2^66
2015-05-08	Squeeky_Squirrel	NF-PM1	B1=195000, B2=6191250, E=12
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-26	Joss	NF-PM1	B1=123080
2014-04-22	Joss	NF-PM1	B1=100000
2014-04-16	Joss	NF-PM1	B1=60000
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-03-18	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-01-28	Sturle Sunde	NF	no factor from 2^60 to 2^61