1 951 597 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
2581447498416388193	19	61.2	2011-08-27 22:19:47
292232734113717391447	21	68.0	2021-01-26 11:41:41

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 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)	1998-02-01	MIT Prime Team	041278492A68C568	0
Verified (Factored)	1999-01-17	Gary Untermeyer	041278492A68C568	172680

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	F4D6CF333B8DD1D3	1	0	1	3
Verified (Factored)	2017-11-11	kkmrkkblmbrbk	F4D6CF333B8DD1D3	1	1213719	1	3
Verified	2021-01-26	MarkS	6C86C5740C121B6C	2	452281	5	3

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2021-01-26	Ben Delo	CERT	PRP Certification Proof certified good
2021-01-26	MarkS	C-PRP	M1951597/2581447498416388193/292232734113717391447 : 6C86C5740C121B6C PRP proof power = 7 PRP: Verified Proof certified good
2021-01-26	_p95holder_	F-ECM	Factor: 292232734113717391447 / (ECM curve 5, B1=50000, B2=5000000)
2017-11-11	kkmrkkblmbrbk	C-PRP	M1951597/2581447498416388193 : F4D6CF333B8DD1D3 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1951597/2581447498416388193 : F4D6CF333B8DD1D3 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2011-08-27	GrunwalderGIMP	F-ECM	Factor: 2581447498416388193
2011-05-16	kurly	NF-PM1	B1=1000000, B2=30000000, E=12
2010-01-18	S485122	NF	no factor from 2^60 to 2^61