[seqfan] Re: Question from Harvey Dale about A233552

Hugo Pfoertner yae9911 at gmail.com
Mon May 27 13:12:05 CEST 2019

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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