[seqfan] Re: multiplicative set-like sequences

Charles Greathouse charles.greathouse at case.edu
Wed Feb 16 15:02:30 CET 2011

I think so, yes.  It's most natural to think of some sequences as
sets, but there may still be interest in the sequence interpretation.

Charles Greathouse
Case Western Reserve University

On Wed, Feb 16, 2011 at 8:36 AM, Max Alekseyev <maxale at gmail.com> wrote:
> SeqFans,
> We have a keyword 'mult' for multiplicative sequences satisfying the property:
> a(mn)=a(m)a(n) if g.c.d.(m,n)=1
> However, besides functional sequences, we have many set-like sequences
> defined by phrases like "Integers n such that ...".
> The multiplicativeness property is naturally defined for such sequences as
> mn in the the sequence if m,n are in the sequence and g.c.d.(m,n)=1
> Should such set-like sequences are also marked with the 'mult' keyword?
> A typical candidate would be A023172.
> Regards,
> Max
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