[seqfan] Re: multiplicative set-like sequences
Juan Arias de Reyna
arias at us.es
Sat Feb 26 10:24:54 CET 2011
I speak as a user of OEIS:
The concept of multiplicative sequence is found in almost any
elementary book on Number Theory: (a_n) is multiplicative if
gcd(n,m)=1 implies a_{nm}=a_n a_m.
I consider that this other concept must be clearly separated
from that now proposed:
> "mn in the the sequence if m,n are in the sequence and g.c.d.(m,n)=1"
Call it as set multiplicative sequences or something similar and consider
a new keyword. (I suggest set-mult )
The same word for two different meanings is surely a bad election.
Best regards,
Juan Arias de Reyna
El 26/02/2011, a las 08:46, Max Alekseyev escribió:
> Neil,
>
> To avoid confusion, we need then to extended the definition of the
> 'mult' keyword given at http://oeis.org/eishelp2.html#RK
> with
> "mn in the the sequence if m,n are in the sequence and g.c.d.(m,n)=1"
>
> or maybe introduce a new keyword like "mult2" (I'm still not sure if
> it is a good idea to have two distinct definitions for the same
> keyword).
>
> Regards,
> Max
>
> On Wed, Feb 16, 2011 at 8:06 PM, N. J. A. Sloane <njas at research.att.com> wrote:
>>> Should such set-like sequences are also marked with the 'mult' keyword?
>> A typical candidate would be A023172.
>>
>> My answer is Yes, certainly!
>> Neil
>>
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