1 284 617 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
37129449840477505738289	23	75.0	2018-03-02 13:50:36

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	829	0
Verified (Factored)		Joel Armengaud	791FBBE166CF4829	0
Verified (Factored)	2002-08-31	S57483	791FBBE166CF4829	575165
Verified (Factored)	2016-06-01	MadPoo	791FBBE166CF4829	393636

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-01	Kriesel	089D7F386D1BFA91	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2018-03-02	ATH	089D7F386D1BFA91	1	1155837	5	3
Verified	2018-03-06	Oliver Kruse	089D7F386D1BFA91	1	1142412	5	3

History

Date	User	Type	Result
2025-09-02	colossalfossil	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	089D7F386D1BFA91 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2018-03-06	Oliver Kruse	C-PRP	M1284617/37129449840477505738289 : 089D7F386D1BFA91 PRP: Verified PRP without proof (not generated)
2018-03-02	ATH	C-PRP	M1284617/37129449840477505738289 : 089D7F386D1BFA91 PRP: Verified PRP without proof (not generated)
2018-03-02	TJAOI	F-ECM	Factor: 37129449840477505738289 / (ECM curve 20, B1=50000, B2=5000000)
2016-08-27	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-08-05	Bruno Victal	NF-PM1	B1=2500000, B2=62500000, E=12
2016-06-01	MadPoo	C-LL	791FBBE166CF4829
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-09-26	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-13	monst	NF	no factor from 2^64 to 2^65
2015-04-12	omylist	NF	no factor from 2^63 to 2^64
2013-11-12	David Campeau	NF-PM1	B1=1195000, B2=34655000, E=12
2012-10-18	dbaugh	NF	no factor from 2^62 to 2^63
2011-05-09	megavink	NF	no factor from 2^61 to 2^62
2009-02-16	Sturle Sunde	NF	no factor from 2^60 to 2^61