[seqfan] Re: Primes where every other digit is 1

[zak seidov]

 11?
    On Friday, October 22, 2021, 08:56:31 AM GMT+3, Neil Sloane <njasloane at gmail.com> wrote:  
 
 This 31,41,61,71,101,131,151,181,191,2131,2141 seems interesting - and it
makes a good puzzle, so yes, please submit it!

Best regards
Neil

Neil J. A. Sloane, Chairman, 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



On Thu, Oct 21, 2021 at 8:59 PM Lars Blomberg <lars.blomberg2 at hotmail.com>
wrote:

> Hello,
>
> Is this of interest:
> 31,41,61,71,101,131,151,181,191,2131,2141, ...
> ?
> ... or 3,7,9.
>
> /Lars Blomberg
>
>
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>

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