Happynumbers

The difference of 135 and 57 is78.

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78 Happy number?  

That is SOOOOOO EZ            \(\frac{happynumber}{happiness}\)

Hugo, look at this.  You said  "The difference of 135 and 57 is78."   

Originally        1 3 5          Reverse the 10's and the 1's positions          1 5 3  

                      –  5 7                                                                               –  7 5   

                      ———                                                                             ———  

                          7 8          and the answer is still 78  WHAAAT?                7 8       

Coincidence?  I think not. 

_.