n=49081 is a probable prime and the limit of testing today is about 50,000.
Alexander Kruppa wrote:
> "Robert G. Wilson v" wrote:
>
> > Yes it is. In fact there are five numbers with this
> > characteristic. (10^n -1)/9 is prime when n is 2, 19, 23, 317 & 1031.
> > See "The Encyclopedia of Integer Sequences" sequence M2114, Neil J.A.
> > Sloane and Simon Plouffe, Academic Press, 1995.
> >
>
> Are all others proved composite, or are the bigger ones merely beyond the
> current limit of primalty testing?
>
> Ciao,
> Alex.
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