[seqfan] multiplicative set-like sequences

Max Alekseyev maxale at gmail.com
Wed Feb 16 14:36:47 CET 2011


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.


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