2 209 903 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
7642404530764180501417	22	72.7	2015-12-09 09:35:08

ECM

Digits	B1	Curves
25	50000	93 / 280

Estimated T-Level: 21.7 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Sverker Nilsson	2B6F7422E74BDA42	0
Verified (Factored)	1999-02-21	Eric Whitney	2B6F7422E74BDA42	1396104

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	C7B858352297C294	1	0	1	3
Verified	2017-10-25	Oliver Kruse	C7B858352297C294	1	565799	1	3

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-04-18	q64	factor ECM small		0.00 %	2025-04-18

P-1 factors

Date	Factor	B1	B2
2015-12-09	7642404530764180501417	2000000	65000000

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2017-10-25	Oliver Kruse	C-PRP	M2209903/7642404530764180501417 : C7B858352297C294 PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M2209903/7642404530764180501417 : C7B858352297C294 PRP: Verified PRP without proof (not generated)
2016-04-18	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2015-12-09	Alexander Dubrovin	F-PM1	Factor: 7642404530764180501417 / (P-1, B1=2000000, B2=65000000, E=12)
2015-12-08	Alexander Dubrovin	NF-PM1	B1=2000000, B2=15000000, E=12
2015-11-11	Alexander Dubrovin	NF-PM1	B1=1000000, B2=2500000, E=6
2015-10-22	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-06	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-06	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-17	Joss	NF-PM1	B1=148088
2014-06-24	Joss	NF-PM1	B1=119044
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2011-01-08	markr	NF-PM1	B1=90000, B2=1665000, E=6
2010-11-10	Joss	NF-PM1	B1=30000
2010-11-06	-Anonymous-	NF-PM1	B1=15000
2009-01-07	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-02	Sturle Sunde	NF	no factor from 2^60 to 2^61