2
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Find the next number from the following

19 => 730

28 => 520

37 => 370

45 => 189

63 => ?
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9
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The number is

243

For the calculation rule

consider the number on the left consisting of two digits $AB$. The number on the right is $(A \times A + B \times B - A \times B) \times (A + B)$

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  • 15
    $\begingroup$ That expression is simpler to write as $A^3+B^3$. $\endgroup$ – f'' Jul 21 '15 at 10:22
  • $\begingroup$ Good catch, I should keep a paper at hand for these kind of riddles. :-) $\endgroup$ – Moghwyn Jul 21 '15 at 10:27
  • 1
    $\begingroup$ @Moghwyn Reminds me about Counting the Legs and dividing by 4 Joke to determine the number of Cows in a farm. $\endgroup$ – kanchirk Jul 21 '15 at 14:28
  • $\begingroup$ @f'': Just for clarity -- the entire expression should be $(A^3 + B^3) \times (A + B)$? $\endgroup$ – GentlePurpleRain Jul 21 '15 at 15:52
  • $\begingroup$ @GentlePurpleRain No. Check the math with both formulas. $\endgroup$ – Joe M Jul 21 '15 at 16:04

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