Puzzle 92 - solution

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  1.  The number 121 is a perfect square in any number number system with base greater than 1. That is because the product of 11 and 11 in any number system is 121. 
  2.  The answer is 121 
    • All the numbers in the sequence are 16 in different number system. First one 10 is 16 in hexadecimal number system. 11 is 16 in number system with base as 15. Next one 12 is 16 in base 14 number system and so on. So our answer is 16 in base 3 = 121.



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