15 551 111 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
231738560376293111083297	24	77.6	2023-04-26 15:39:02
98919408087537686766864943466043491153	38	126.2	2020-07-26 06:06:31

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

TF below 2^61 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2002-10-26	Paul Mazumdar	CAEE2E2F1463E6A5	10531489
Verified (Factored)	2006-07-25	David A. Evans	CAEE2E2F1463E6A5	69138

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2020-08-04	M Miller	844FC7B6B822119E	1	7288526	5	3
Verified (Factored)	2020-09-19	Jaytholomew	844FC7B6B822119E	1	440422	5	3
Verified	2023-04-26	Naegi Makoto	844FC7B6B822119E	2	7624159	5	3

P-1 factors

Date	Factor	B1	B2
2020-07-26	98919408087537686766864943466043491153	1500000	30000000
2023-04-26	231738560376293111083297	3000000	14490496020

History

Date	User	Type	Result
2023-04-26	curtisc	CERT	PRP Certification Proof certified good
2023-04-26	Naegi Makoto	C-PRP	M15551111/98919408087537686766864943466043491153/231738560376293111083297 : 844FC7B6B822119E PRP proof power = 8 PRP: Verified Proof certified good
2023-04-26	Naegi Makoto	F-PM1	Factor: 231738560376293111083297 / (P-1, B1=3000000, B2=14490496020)
2020-09-19	Architects Cubed	CERT	PRP Certification Proof certified good
2020-09-19	Jaytholomew	C-PRP	M15551111/98919408087537686766864943466043491153 : 844FC7B6B822119E PRP proof power = 8 PRP: Verified (Factored) Proof certified good
2020-08-04	M Miller	C-PRP	M15551111/98919408087537686766864943466043491153 : 844FC7B6B822119E PRP: Verified (Factored) PRP without proof (not generated)
2020-07-26	Tha	F-PM1	Factor: 98919408087537686766864943466043491153 / (P-1, B1=1500000, B2=30000000, E=12)
2018-02-08	ramgeis	NF	no factor from 2^68 to 2^69
2018-02-08	ramgeis	NF	no factor from 2^67 to 2^68
2016-03-16	Mark Rose	NF	no factor from 2^65 to 2^66
2013-12-28	Nesowa	NF	no factor from 2^66 to 2^67