[seqfan] Re: when is 1234...n a prime?

[Max Alekseyev]

I've completed the search below 10^5 -- still no primes.
Max

On Sat, Oct 3, 2015 at 9:08 AM, Max Alekseyev <maxale at gmail.com> wrote:

> Just a brief update -- there are no primes among first 77,000 terms.
>
> Regards,
> Max
>
>
> On Tue, Sep 29, 2015 at 9:18 PM, Neil Sloane <njasloane at gmail.com> wrote:
> > To Seq Fans:
> >
> > Consider the sequence with nth term equal to the
> > concatenation of the decimal numbers 1234...n (https://oeis.org/A007908
> ).
> > When is the first prime? The comments in A007908 say
> > that there should be infinitely many primes, and that there
> > are no primes among the first 64000 terms.
> > If you would like to help with this search, you could leave a comment
> > in A007908 saying that there are no primes among terms X through Y,
> > or, of course, that n = Z gives a (probable) prime, which would be
> > pretty exciting.
> >
> >
> > Best regards
> > Neil
> >
> > Neil J. A. Sloane, President, OEIS Foundation.
> > 11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
> > Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
> > Phone: 732 828 6098; home page: http://NeilSloane.com
> > Email: njasloane at gmail.com
> >
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