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

[M. F. Hasler]

See A071620 ...

On Thu, Oct 15, 2015 at 11:35 AM, Robert G. Wilson v <rgwv at rgwv.com> wrote:
> Seq. Fans,
>
>         While we have not found any terms in A007908 which are primes, such is not the case for A252043. A007908 is a subsequence of A252043.
>
>         I found 10, 14, 24, 235, 2804, 4347, …, . The search limit was 25000.
>
> Bob.
>
> -----Original Message-----
> From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Max Alekseyev
> Sent: Monday, October 12, 2015 12:03 AM
> To: Sequence Fanatics Discussion list
> Subject: [seqfan] Re: when is 1234...n a prime?
>
> 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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>>
>
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