1 550 413 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
184839301610166178740572280199	30	97.2	2015-03-25 10:09:12

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 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)		Jeremy Buhler	4DF3A645B4770333	0
Verified (Factored)	1998-10-25	Sam Robertson	4DF3A645B4770333	314081

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	2F2F944C871190AF	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-01	Oliver Kruse	1FA2128C79943492	1	0	1	3
Verified	2017-11-10	kkmrkkblmbrbk	1FA2128C79943492	1	137620	1	3

P-1 factors

Date	Factor	B1	B2
2015-03-25	184839301610166178740572280199	10000000	200000000

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	2F2F944C871190AF PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2022-03-08	LordJulius	NF	no factor from 2^58 to 2^60
2017-11-10	kkmrkkblmbrbk	C-PRP	M1550413/184839301610166178740572280199 : 1FA2128C79943492 PRP: Verified PRP without proof (not generated)
2017-10-01	Oliver Kruse	C-PRP	M1550413/184839301610166178740572280199 : 1FA2128C79943492 PRP: Verified PRP without proof (not generated)
2015-03-25	VictordeHollander	F-PM1	Factor: 184839301610166178740572280199 / (P-1, B1=10000000, B2=200000000, E=12)
2015-02-16	snme2pm1	NF	no factor from 2^64 to 2^65
2015-02-16	snme2pm1	NF	no factor from 2^63 to 2^64
2013-12-07	David Campeau	NF-PM1	B1=945000, B2=27405000, E=12
2011-02-04	James Heinrich	NF-PM1	B1=80000, B2=1360000, E=6
2010-06-10	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-29	Architects Cubed	NF	no factor from 2^60 to 2^61