321 187 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
64631168576317449018081721	26	85.7	2019-03-14 20:58:50

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	553 / 640

Estimated T-Level: 29.3 ⓘ

TF below 2^92 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	4820	0
Verified (Factored)		Unknown	4820	0
Verified (Factored)		Guillermo Ballester Valor	26450216F0934820	0
Verified (Factored)		Eivind Triel	26450216F0934820	114856
Verified (Factored)	2002-01-15	Dennis Pope	26450216F0934820	229058

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-03-15	artorollo	9B4689B63A0C0F88	1	144232	5	3
Verified	2019-03-16	kkmrkkblmbrbk	9B4689B63A0C0F88	1	209056	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-03-16	kkmrkkblmbrbk	C-PRP	M321187/64631168576317449018081721 : 9B4689B63A0C0F88 PRP: Verified PRP without proof (small exponent)
2019-03-15	artorollo	C-PRP	M321187/64631168576317449018081721 : 9B4689B63A0C0F88 PRP: Verified PRP without proof (small exponent)
2019-03-14	alex	F-ECM	Factor: 64631168576317449018081721 / (ECM curve 361, B1=250000, B2=25000000, Sigma=3750092086975011)
2018-01-22	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-06-21	mikr	NF-PM1	B1=60000000, B2=3000000000, E=12
2015-12-08	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-12-08	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-07-22	NR	NF	no factor from 2^61 to 2^62
2012-04-27	David Campeau	NF	no factor from 2^60 to 2^61
2012-01-18	alpertron	NF-PM1	B1=10000000, B2=200000000, E=12
2011-08-06	Joss	NF-PM1	B1=1448663
2009-01-23	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-30	Sturle Sunde	NF	no factor from 2^58 to 2^59