Basic Examples 
(3)
 

The first 20 composites:
In[1]:=
Table
[◼]
Composite
[n],{n,20}
Out[1]=
{4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32}
———
The billionth composite:
In[1]:=
[◼]
Composite
[10^9]
Out[1]=
1053422339
———
Plot the sequence:
In[1]:=
DiscretePlot
[◼]
Composite
[n],{n,100}
Out[1]=