1 882 421 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
152494587951688799	18	57.1	old
199215476607625391279	21	67.4	2021-04-03 16:37:19

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)		John R Pierce	7A12B98B08352CCD	0
Verified (Factored)	1998-12-21	John Ibe	7A12B98B08352CCD	0
Verified (Factored)	1999-02-21	Mark Klosowski	7A12B98B08352CCD	1343119

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-04	Oliver Kruse	C63145B0181A1578	1	0	1	3
Verified (Factored)	2017-11-08	kkmrkkblmbrbk	C63145B0181A1578	1	1218004	1	3
Verified	2021-04-06	arnaud	CB6A36B14AF39D7E	2	1423140	5	3
Verified	2021-04-07	LaurV	CB6A36B14AF39D7E	2	549395	5	3

History

Date	User	Type	Result
2021-04-07	Simon Josefsson	CERT	PRP Certification Proof certified good
2021-04-07	LaurV	C-PRP	M1882421/152494587951688799/199215476607625391279 : CB6A36B14AF39D7E PRP proof power = 7 PRP: Verified Proof certified good
2021-04-06	arnaud	C-PRP	M1882421/152494587951688799/199215476607625391279 : CB6A36B14AF39D7E PRP: Verified PRP without proof (not generated)
2021-04-03	_p95holder_	F-ECM	Factor: 199215476607625391279 / (ECM curve 7, B1=50000, B2=5000000)
2017-11-08	kkmrkkblmbrbk	C-PRP	M1882421/152494587951688799 : C63145B0181A1578 PRP: Verified PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1882421/152494587951688799 : C63145B0181A1578 PRP: Verified PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12