2 528 651 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
40648562979343842755377	23	75.1	2020-06-12 08:34:03

ECM

Digits	B1	Curves
25	50000	37 / 280

Estimated T-Level: 20.7 ⓘ

TF below 2^64 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Michael B. Clark	C1399A24174C933F	0
Verified (Factored)	1999-03-26	James S Dehling	C1399A24174C933F	2241030
Verified (Factored)	2018-06-07	kkmrkkblmbrbk	C1399A24174C933F	1305294

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-06-13	M Miller	4B4D4A6851E9F7B2	1	804431	5	3
Verified	2020-06-13	ATH	4B4D4A6851E9F7B2	1	1004761	5	3

History

Date	User	Type	Result
2020-06-13	ATH	C-PRP	M2528651/40648562979343842755377 : 4B4D4A6851E9F7B2 PRP: Verified PRP without proof (not generated)
2020-06-13	M Miller	C-PRP	M2528651/40648562979343842755377 : 4B4D4A6851E9F7B2 PRP: Verified PRP without proof (not generated)
2020-06-12	MarkS	F-ECM	Factor: 40648562979343842755377 / (ECM curve 1, B1=50000, B2=5000000, Sigma=309555475080518)
2019-04-15	TJAOI	NF	no factor from 2^67 to 2^68
2018-06-26	mikr	NF-PM1	B1=3000000, B2=135000000, E=12
2018-06-07	kkmrkkblmbrbk	C-LL	C1399A24174C933F
2017-12-16	Joss	NF-PM1	B1=600000, B2=6000000, E=6
2017-08-08	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-11-08	ramgeis	NF	no factor from 2^65 to 2^66
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
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-14	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-03-17	James Heinrich	NF-PM1	B1=300000, B2=8000000, E=12
2011-01-06	Joss	NF-PM1	B1=50000
2011-01-02	Joss	NF-PM1	B1=30000
2010-12-19	Joss	NF-PM1	B1=20000
2009-01-31	Sturle Sunde	NF	no factor from 2^60 to 2^61