Consider the divisor table:

http://www.research.att.com/~njas/sequences/A051731

1              
               
1 0            
1 1            
               
1 0 0          
1 1 0          
1 0 1          
               
1 0 0 0        
1 1 0 0        
1 0 1 0        
1 1 0 1        
               
1 0 0 0 0      
1 1 0 0 0      
1 0 1 0 0      
1 1 0 1 0      
1 0 0 0 1      
               
1 0 0 0 0 0    
1 1 0 0 0 0    
1 0 1 0 0 0    
1 1 0 1 0 0    
1 0 0 0 1 0    
1 1 1 0 0 1    
               
1 0 0 0 0 0 0  
1 1 0 0 0 0 0  
1 0 1 0 0 0 0  
1 1 0 1 0 0 0  
1 0 0 0 1 0 0  
1 1 1 0 0 1 0  
1 0 0 0 0 0 1  
               
1 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0
1 0 1 0 0 0 0 0
1 1 0 1 0 0 0 0
1 0 0 0 1 0 0 0
1 1 1 0 0 1 0 0
1 0 0 0 0 0 1 0
1 1 0 1 0 0 0 1

Mats Granvik

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