2 281 297 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
11421382196526034597673	23	73.3	2013-08-31 05:42:50

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	118 / 640

Estimated T-Level: 25.9 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		Don Groves	165C621F044CEF5E	0
Verified (Factored)	1999-03-01	James Arnold	165C621F044CEF5E	1811157

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-11	Oliver Kruse	72F1ECBD074D106D	1	0	1	3
Verified	2017-11-22	kkmrkkblmbrbk	72F1ECBD074D106D	1	1468865	1	3

History

Date	User	Type	Result
2017-11-22	kkmrkkblmbrbk	C-PRP	M2281297/11421382196526034597673 : 72F1ECBD074D106D PRP: Verified PRP without proof (not generated)
2017-10-11	Oliver Kruse	C-PRP	M2281297/11421382196526034597673 : 72F1ECBD074D106D PRP: Verified PRP without proof (not generated)
2016-04-11	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2013-08-31	arnaud	F-ECM	Factor: 11421382196526034597673
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-09	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-15	Oscar Östlin	NF-PM1	B1=85000, B2=1742500, E=6
2010-11-24	Oscar Östlin	NF-PM1	B1=75011
2010-11-14	Joss	NF-PM1	B1=20000
2010-11-07	Joss	NF-PM1	B1=15000
2009-01-16	Sturle Sunde	NF	no factor from 2^60 to 2^61