2197 is Cube of 13

Theorem

$13^3 = 2197$


Proof

By long multiplication: 

   13
 x 13
-----
   39
  130
-----
  169
-----

then: 

 x 169
    13
------
   507
  1690
-----
  2197
------

$\blacksquare$


Sources

  • 1997: Donald E. Knuth: The Art of Computer Programming: Volume 1: Fundamental Algorithms (3rd ed.) ... (previous) ... (next): Notes on the Exercises: Exercise $3$
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