1 931 309 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
15450473	8	23.9	old
74126775865817	14	46.1	2014-02-04 11:43:57
206872507641370128839153	24	77.5	2020-11-06 18:22:30

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	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	E115C163CB9094DD	2	0	1	3
Verified (Factored)	2017-11-10	kkmrkkblmbrbk	E115C163CB9094DD	2	81020	1	3
Verified	2020-11-07	mrh	6B434637896351D9	3	212081	5	3

History

Date	User	Type	Result
2020-11-07	atrench	CERT	PRP Certification Proof certified good
2020-11-07	mrh	C-PRP	M1931309/15450473/74126775865817/206872507641370128839153 : 6B434637896351D9 PRP proof power = 7 PRP: Verified Proof certified good
2020-11-06	nordi	F-ECM	Factor: 206872507641370128839153 / (ECM curve 5, B1=50000, B2=5000000, Sigma=2544677737032957)
2017-11-10	kkmrkkblmbrbk	C-PRP	M1931309/15450473/74126775865817 : E115C163CB9094DD PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1931309/15450473/74126775865817 : E115C163CB9094DD PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2014-02-04	TJAOI	F	Factor: 74126775865817