Prime index of a palindromic hexagonal number

 
 
A hexagonal number is a polygonal number of the form   n \, (2 \, n - 1)

 

9561677372927686361   is a 19-digital prime index of the 39-digital palindromic hexagonal number:

9561677372927686361 \,(2 \times 9561677372927686361 - 1)
       = \; 182851348367914603505306419763843158281

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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About benvitalis

math grad - Interest: Number theory
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