2 627 291 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
188560915422777827921	21	67.4	2015-12-13 12:32:35

ECM

Digits	B1	Curves
25	50000	14 / 280

Estimated T-Level: 20.3 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		John Crider	1661F6374C07463F	0
Verified (Factored)	1999-04-13	Ethan O'Connor	1661F6374C07463F	2076255

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	8639D5CF03310DA3	1	0	1	3
Verified	2017-11-13	Oliver Kruse	8639D5CF03310DA3	1	756522	1	3

History

Date	User	Type	Result
2022-03-11	LordJulius	NF	no factor from 2^1 to 2^60
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-11-13	Oliver Kruse	C-PRP	M2627291/188560915422777827921 : 8639D5CF03310DA3 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M2627291/188560915422777827921 : 8639D5CF03310DA3 PRP: Verified PRP without proof (not generated)
2015-12-13	guru	F-ECM	Factor: 188560915422777827921 / (ECM curve 2, B1=50000, B2=5000000)
2015-02-23	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-23	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-12	markr	NF	no factor from 2^61 to 2^62
2011-02-27	James Heinrich	NF-PM1	B1=300000, B2=8000000, E=12
2011-01-19	Joss	NF-PM1	B1=50000
2010-12-26	Joss	NF-PM1	B1=30000
2010-12-21	Joss	NF-PM1	B1=20000
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61