2 611 061 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
4795386908746187384359	22	72.0	2019-12-07 02:29:13

ECM

Digits	B1	Curves
25	50000	65 / 280

Estimated T-Level: 21.2 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Lance Remington Hampton	7A9238B52F8BA20B	0
Verified (Factored)	1999-06-06	Nathan Stohs	7A9238B52F8BA20B	970778
Verified (Factored)	2018-06-30	kkmrkkblmbrbk	7A9238B52F8BA20B	2305541

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-12-07	mrh	D56A00B87BAFD4AB	1	2116331	5	3
Verified	2019-12-08	marssystems	D56A00B87BAFD4AB	1	2259298	5	3

History

Date	User	Type	Result
2019-12-08	marssystems	C-PRP	M2611061/4795386908746187384359 : D56A00B87BAFD4AB PRP: Verified PRP without proof (not generated)
2019-12-07	mrh	C-PRP	M2611061/4795386908746187384359 : D56A00B87BAFD4AB PRP: Verified PRP without proof (not generated)
2019-12-07	masser	F-ECM	Factor: 4795386908746187384359 / (ECM curve 13, B1=50000, B2=5000000)
2019-10-06	masser	NF-PM1	B1=2611061, B2=26110610, E=12
2019-04-29	TJAOI	NF	no factor from 2^67 to 2^68
2018-06-30	kkmrkkblmbrbk	C-LL	7A9238B52F8BA20B
2017-08-28	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-07-10	Joss	NF-PM1	B1=400000, B2=4000000, E=6
2016-05-21	Joss	NF-PM1	B1=200000, B2=3600000, E=6
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2016-01-16	ramgeis	NF	no factor from 2^65 to 2^66
2015-02-18	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-18	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-10	Joss	NF-PM1	B1=124582
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-23	Grant McCracken	NF	no factor from 2^61 to 2^62
2010-12-14	markr	NF-PM1	B1=100000, B2=2125000, E=6
2010-11-17	Joss	NF-PM1	B1=20000
2009-01-29	Sturle Sunde	NF	no factor from 2^60 to 2^61