857 251 721 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite: 1 known prime factor

Trial Factored to 2⁷⁵

TF target 2⁸⁵

Factored

Factor	Digits	Bits	Date
19995702270161519223919	23	74.1	2024-06-19 06:48:34

History

Date	User	Type	Result
2025-05-16	Greg	F	Factor: 19995702270161519223919 / TF: 74-75
2024-06-19	SRBase	F	Factor: 19995702270161519223919 / TF: 74-75*
2022-12-11	SRBase	NF	no factor TF: 73-74
2021-06-12	SRBase	NF	no factor TF: 72-73
2020-10-13	SRBase	NF	no factor TF: 71-72
2019-03-17	srow7	NF	no factor TF: 70-71
2017-01-08	ramgeis	NF	no factor TF: 68-70
2015-09-02	sasaki	NF	no factor TF: 67-68
2015-03-09	sasaki	NF	no factor TF: 66-67
2012-04-09	David Campeau	NF	no factor TF: 64-66
2010-08-03	linded	NF	no factor TF: 63-64