15 208 471 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
80932082863664309663	20	66.1	2014-05-28 13:21:42
19411448654114747598257	23	74.0	2023-05-29 01:33:51

Status	Date	User	Residue	Shift
Verified (Factored)	2002-05-05	Søren Lund Kristensen	26EBEE95A68C76A2	9794932
Verified (Factored)	2005-11-13	Martin Smith	26EBEE95A68C76A2	834587

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2023-06-28	Perig	EA91128AF03DFBDE	2	7128138	5	3

P-1 factors

Date	Factor	B1	B2
2023-05-29	19411448654114747598257	400000	407843436

History

Date	User	Type	Result
2023-06-29	curtisc	CERT	PRP Certification Proof certified good
2023-06-28	Perig	C-PRP	M15208471/80932082863664309663/19411448654114747598257 : EA91128AF03DFBDE PRP proof power = 8 PRP: Verified Proof certified good
2023-05-29	nordi	F-PM1	Factor: 19411448654114747598257 / (P-1, B1=400000, B2=407843436)
2023-05-12	nordi	NF-PM1	B1=400000
2022-04-24	Lisander Viaene	NF	no factor from 2^67 to 2^68
2014-05-28	Nesowa	F	Factor: 80932082863664309663 / TF: 66-67
2014-05-28	Nesowa	NF	no factor from 2^65 to 2^66