268 637 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
47521887712083183578987279	26	85.3	2015-11-12 04:40:16

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	396 / 640

Estimated T-Level: 28.1 ⓘ

TF below 2^88 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	515B	0
Verified (Factored)		Unknown	515B	0
Verified (Factored)		Brian J. Beesley	5C3A4C0AF6AED15B	0
Verified (Factored)		Eivind Triel	5C3A4C0AF6AED15B	208383
Verified (Factored)	2001-11-10	Brian J. Beesley	5C3A4C0AF6AED15B	211940

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-22	Oliver Kruse	FD30CEA115B99006	1	0	1	3
Verified	2017-09-30	alpertron	FD30CEA115B99006	1	0	1	3
Verified	2017-12-07	ATH	FD30CEA115B99006	1	33315	1	3
Unverified (Reliable)	2020-04-17	Oliver Kruse	09B561BE30CDED__	1	240427	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^57 to 2^58
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2020-04-17	Oliver Kruse	C-PRP	M268637/47521887712083183578987279 : 09B561BE30CDED__ PRP: Unverified (Reliable) PRP without proof (small exponent)
2017-12-07	ATH	C-PRP	M268637/47521887712083183578987279 : FD30CEA115B99006 PRP: Unverified (Reliable) PRP without proof (small exponent)
2017-09-30	alpertron	C-PRP	M268637/47521887712083183578987279 : FD30CEA115B99006 PRP: Unverified (Reliable) PRP without proof (not generated)
2017-09-22	Oliver Kruse	C-PRP	M268637/47521887712083183578987279 : FD30CEA115B99006 PRP: Unverified (Reliable) PRP without proof (not generated)
2017-09-22	Oliver Kruse	C-PRP	M268637/47521887712083183578987279 : FD30CEA115B99006 PRP without proof (not generated)
2015-11-12	bam	F-ECM	Factor: 47521887712083183578987279 / (ECM curve 2, B1=250000, B2=25000000)
2015-08-25	NR	NF	no factor from 2^61 to 2^62
2013-10-14	David Campeau	NF-PM1	B1=2425000, B2=67900000, E=12
2013-07-06	lycorn	NF	no factor from 2^60 to 2^61
2012-02-26	Joss	NF-PM1	B1=2282882
2011-02-16	Joss	NF-PM1	B1=2000000
2009-01-24	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59