[seqfan] Name for a type of set needed

Bob Selcoe rselcoe at entouchonline.net
Sat Mar 25 02:24:24 CET 2017

Hi Seqfans,

I just proposed sequence A284311, titled: "Array T(n,k) read by 
antidiagonals: T(1,k) = squarefree numbers > 1 in ascending order 
(A005117(k)); columns are non-squarefree numbers (in ascending order) with 
the exact same prime factors as T(1,k)".

So for example, Column 6 is the set whose members have prime factors {2,5}: 
{10, 20, 40, 50, 80, 100, 160, 200...}.

Is there a standard name for such sets?

Bob Selcoe 

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