18 590 567 Exponent Status

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

PrimeNet Exponent Status

M_n

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Details

Factored

Factor	Digits	Bits	Date
681455563964177347944798697	27	89.1	2019-01-26 13:43:42

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)	2003-08-25	Krzysztof Hojan	450E881D0F85A67D	7347804
Verified (Factored)	2007-04-07	Philippe	450E881D0F85A67D	12059785

History

Date	User	Type	Result
2019-01-26	Sergey Nosov	F-ECM	Factor: 681455563964177347944798697 / (ECM curve 1, B1=50000, B2=5000000)
2018-02-02	ramgeis	NF	no factor from 2^68 to 2^69
2018-02-02	ramgeis	NF	no factor from 2^67 to 2^68
2014-08-10	Nesowa	NF	no factor from 2^66 to 2^67

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