Primefree sequences in the OEIS

Alonso Del Arte alonso.delarte at gmail.com
Fri Oct 21 19:38:36 CEST 2005


I posted the question to PrimeFan at his Wikipedia user talk page.

It seems to me that he meant the sequences considered in their
infinite totality. A000578 should not contain any primes, since it's
the sequence of cubes. And A002808 should certainly not contain
primes.

Alonso

On 10/20/05, Jud McCranie <j.mccranie at adelphia.net> wrote:
> At 07:38 PM 10/20/2005, N. J. A. Sloane wrote:
>
> >Sequence An in Sloane's Online Encyclopedia of Integer Sequences
> >contains no primes.
> >
> >THIS IS REALLY ill-defined!  There are two interpretations:
> >A_n as visible in the current OEIS contains no primes
> >or
> >A_n when considered in full - meaning usually all infinitely
> >many terms - contains no prime
> >
> >Only the second version is at all interesting, but I'm afraid
> >it was the former that was calculated. Does anyone know?
>
> I don't know what was actually done, but it would not be feasible to do the
> second one.
>
>
>






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