[seqfan] Re: Question from Harvey Dale about A233552

[Neil Sloane]

For A233552, I have added a strong warning that the entry is horribly
wrong.

There has been a lot of discussion here.  Could someone give a summary?
What is the correct start of the sequence?  How many initial terms can we
say for certain are correct?

Same question for A233551.

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



On Mon, May 27, 2019 at 7:12 AM Hugo Pfoertner <yae9911 at gmail.com> wrote:

> Found an "easy" answer myself: 2495 is not in the sequence because
> (2495*4^17121+1)/3 is (pseudo)prime. One might be less lucky for other
> candidates like 3419, 3719, 5459, 5837, 8447, 9521, ...
>
> On Mon, May 27, 2019 at 12:51 PM Hugo Pfoertner <yae9911 at gmail.com> wrote:
>
> > For http://oeis.org/A233551 an example "2495 is not in the sequence
> > because ...." would definitely help to understand the construction. Until
> > that is provided, the sequence deserves the keyword "obsc", at least in
> my
> > opinion.
> >
>
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