1 868 387 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
47921710426667081	17	55.4	old
1925487808964058219400823	25	80.7	2021-03-28 12:35:42

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	108 / 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)	2017-10-04	Oliver Kruse	84B79B042A8D6862	1	0	1	3
Verified (Factored)	2017-11-07	kkmrkkblmbrbk	84B79B042A8D6862	1	1536028	1	3
Verified	2021-03-30	Oliver Kruse	672B2513AD773A3F	2	1043520	5	3

History

Date	User	Type	Result
2021-06-08	happy5214	NF-PP1	Start=2/7, B1=2500000, B2=195000000
2021-06-08	happy5214	NF-PM1	B1=5000000, B2=515000000
2021-03-30	Jeff Vanderau	CERT	PRP Certification Proof certified good
2021-03-30	Oliver Kruse	C-PRP	M1868387/47921710426667081/1925487808964058219400823 : 672B2513AD773A3F PRP proof power = 7 PRP: Verified Proof certified good
2021-03-28	Chang Chia-Tche	F-ECM	Factor: 1925487808964058219400823 / (ECM curve 5, B1=50000, B2=5000000, Sigma=5083187339905575)
2017-11-07	kkmrkkblmbrbk	C-PRP	M1868387/47921710426667081 : 84B79B042A8D6862 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1868387/47921710426667081 : 84B79B042A8D6862 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12