The book is now available! 1729
(another Prime Pages' Curiosity)
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The largest number which is divisible by its prime sum of digits (19) and reversal (91) happens to be Ramanujan's famous taxi-cab number (1729 = 123 + 13 = 103 + 93). It is the smallest number expressible as the sum of two positive cubes in two different ways.

 

  Submitted: 1999-09-02 18:40:00;   Last Modified: 2008-01-30 11:28:00.



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