2 212 361 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
1953220014586778825501351	25	80.7	2016-07-05 00:42:57

ECM

Digits	B1	Curves
25	50000	94 / 280

Estimated T-Level: 21.7 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Jack Ritter	4B81682B324A5AAF	0
Verified (Factored)	1999-03-15	Shaun Griffith	4B81682B324A5AAF	1861131

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-09	Oliver Kruse	130F0A6A40D42C05	1	0	1	3
Verified	2017-11-20	ATH	130F0A6A40D42C05	1	962420	1	3

History

Date	User	Type	Result
2017-11-20	ATH	C-PRP	M2212361/1953220014586778825501351 : 130F0A6A40D42C05 PRP: Verified PRP without proof (not generated)
2017-10-09	Oliver Kruse	C-PRP	M2212361/1953220014586778825501351 : 130F0A6A40D42C05 PRP: Verified PRP without proof (not generated)
2016-07-05	bam	F-ECM	Factor: 1953220014586778825501351 / (ECM curve 2, B1=50000, B2=5000000)
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2015-12-11	Alexander Dubrovin	NF-PM1	B1=2000000, B2=65000000, E=12
2015-11-14	Alexander Dubrovin	NF-PM1	B1=1500000, B2=10000000, E=12
2015-10-22	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-06	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-06	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-11-13	c10ck3r	NF-PM1	B1=500000, B2=10000000, E=12
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2011-01-08	markr	NF-PM1	B1=90000, B2=1665000, E=6
2010-11-10	Joss	NF-PM1	B1=30000
2010-11-06	-Anonymous-	NF-PM1	B1=15000
2009-01-07	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-03	Sturle Sunde	NF	no factor from 2^60 to 2^61