Math Notes

                                       1 
                                      1 1 
                                     1 0 1 
                                    1 0 0 1 
                                   1 0 0 0 1 
                                  1 0 0 0 0 1 
                                 1 0 0 0 0 0 1 
                                1 0 0 0 0 0 0 1 
                               1 0 0 0 0 0 0 0 1 
                              1 0 0 0 0 0 0 0 0 1 
                             1 0 0 0 0 0 0 0 0 0 1 
                            1 0 0 0 0 0 0 0 0 0 0 1 
                           1 0 0 0 0 0 0 0 0 0 0 0 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
  1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
   1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
    1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
     1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
      1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
       1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
        1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
         1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
          1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
           1 0 0 0 0 0 0 0 0 0 0 1 1 1 9 1 1 1 0 0 0 0 0 0 0 0 0 0 1 
            1 0 0 0 0 0 0 0 0 0 0 1 9 9 9 9 1 0 0 0 0 0 0 0 0 0 0 1 
             1 0 0 0 0 0 0 0 0 0 0 1 9 2 9 1 0 0 0 0 0 0 0 0 0 0 1 
            1 0 0 0 0 0 0 0 0 0 0 1 9 9 9 9 1 0 0 0 0 0 0 0 0 0 0 1 
           1 0 0 0 0 0 0 0 0 0 0 1 1 1 9 1 1 1 0 0 0 0 0 0 0 0 0 0 1 
          1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
         1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1  
        1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
       1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
      1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
     1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
    1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
   1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
  1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 
                           1 0 0 0 0 0 0 0 0 0 0 0 1 
                            1 0 0 0 0 0 0 0 0 0 0 1 
                             1 0 0 0 0 0 0 0 0 0 1 
                              1 0 0 0 0 0 0 0 0 1 
                               1 0 0 0 0 0 0 0 1 
                                1 0 0 0 0 0 0 1 
                                 1 0 0 0 0 0 1 
                                  1 0 0 0 0 1 
                                   1 0 0 0 1 
                                    1 0 0 1 
                                     1 0 1 
                                      1 1 
                                       1

Amazingly, this is a prime number. When the digits are assembled into one long string, beginning at the top of the star and reading each row left to right, they form a 1093-digit number whose only factors are 1 and itself.

It was discovered by Australian mathematician Michael Hartley. See more of his prime curios.

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