8 171 081 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁶⁹

TF target 2⁶⁷

Factored

Factor	Digits	Bits	Date
485215131943	12	38.8	old

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2018-09-05	Oliver Kruse	F43BD61E3B54F8F2	1	3403233	5	3
Verified	PRP without proof (not generated)	2020-04-20	GAN	F43BD61E3B54F8F2	1	5331691	5	3

History

Date	User	Type	Result
2025-05-13	Wentao Huang	NF-PM1	B1=1080000, B2=107050650
2023-12-04	Flaukrotist	NF	no factor TF: 68-69
2022-08-04	Flaukrotist	NF	no factor TF: 67-68
2020-04-20	GAN	C-PRP	M8171081/485215131943 : F43BD61E3B54F8F2
2018-09-05	Oliver Kruse	C-PRP	M8171081/485215131943 : F43BD61E3B54F8F2

Username
Password