X Marks the Spot

What is the value of X in the following sequence?

18, 46, 94, 63, X

 

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May 22nd, 2011 | Category: Brain Riddle, Mathematical |  Email This Riddle

2 guesses to X Marks the Spot

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• Jordan

  May 29, 2011 at 12:13 AM

  x=52
  18=81
  46=64
  94=49
  36=63
  the nos. are opposite of perfect squares

• Dude

  May 31, 2011 at 8:46 AM

  52 is correct!

  Each number, when reversed is the square root coming down from 9×9, 8×8, etc.

  You’re today’s winner.