2 455 561 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
4417489984060290169	19	61.9	2012-06-07 14:42:47

ECM

Digits	B1	Curves
25	50000	158 / 280

Estimated T-Level: 22.8 ⓘ

TF below 2^71 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Steve Nicolai	488E82C893264378	0
Verified (Factored)		Simon Burge	488E82C893264378	0

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-13	Oliver Kruse	AE4DDA3E75E3F36E	1	2204934	5	3
Verified	2017-11-28	nokno	EBCC2B601E92AE39	1	0	1	3
Verified	2017-11-29	kkmrkkblmbrbk	AE4DDA3E75E3F36E	1	1262740	5	3
Verified	2017-12-04	kkmrkkblmbrbk	EBCC2B601E92AE39	1	1890653	1	3

History

Date	User	Type	Result
2022-03-10	LordJulius	NF	no factor from 2^1 to 2^60
2018-09-28	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-12-04	kkmrkkblmbrbk	C-PRP	M2455561/4417489984060290169 : EBCC2B601E92AE39 PRP: Verified PRP without proof (not generated)
2017-11-29	kkmrkkblmbrbk	C-PRP	M2455561/4417489984060290169 : AE4DDA3E75E3F36E PRP: Verified PRP without proof (not generated)
2017-11-28	nokno	C-PRP	M2455561/4417489984060290169 : EBCC2B601E92AE39 PRP: Verified PRP without proof (not generated)
2017-10-13	Oliver Kruse	C-PRP	M2455561/4417489984060290169 : AE4DDA3E75E3F36E PRP: Verified PRP without proof (not generated)
2012-06-07	Sebastian Hornbostel	F-ECM	Factor: 4417489984060290169
2011-01-19	Oscar Östlin	NF-PM1	B1=95000, B2=1947500, E=6
2010-12-22	Joss	NF-PM1	B1=20000
2009-01-14	Sturle Sunde	NF	no factor from 2^60 to 2^61