1 900 429 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
64051240192957784958178873	26	85.7	2018-08-27 10:51:11

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)		Mark Rawlings	B25C007A206028E4	0
Verified (Factored)	1999-01-29	Tobias Herbst	B25C007A206028E4	1056793
Verified (Factored)	2015-07-14	MadPoo	B25C007A206028E4	1410511

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	ECBC1790F8EB0A99	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2018-08-28	_p95holder_	ECBC1790F8EB0A99	1	1686857	5	3
Verified	2018-08-31	ANONYMOUS	ECBC1790F8EB0A99	1	374036	5	3

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	ECBC1790F8EB0A99 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2018-08-31	ANONYMOUS	C-PRP	M1900429/64051240192957784958178873 : ECBC1790F8EB0A99 PRP: Verified PRP without proof (not generated)
2018-08-28	_p95holder_	C-PRP	M1900429/64051240192957784958178873 : ECBC1790F8EB0A99 PRP: Verified PRP without proof (not generated)
2018-08-27	bam	F-ECM	Factor: 64051240192957784958178873 / (ECM curve 2, B1=50000, B2=5000000)
2017-11-20	mikr	NF-PM1	B1=8000000, B2=320000000, E=12
2017-03-02	Smok_bmv	NF	no factor from 2^66 to 2^67
2015-08-30	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-14	MadPoo	C-LL	B25C007A206028E4
2015-05-19	omylist	NF	no factor from 2^64 to 2^65
2015-05-19	omylist	NF	no factor from 2^63 to 2^64
2011-06-08	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2011-02-07	Carsten Kossendey	NF-PM1	B1=105000, B2=1785000, E=6
2011-01-07	GrunwalderGIMP	NF	no factor from 2^62 to 2^63
2011-01-07	GrunwalderGIMP	NF	no factor from 2^61 to 2^62
2009-05-23	Architects Cubed	NF	no factor from 2^60 to 2^61