Puzzle 92 - Perfect square
1. The number 121 is a perfect square. In a decimal system. In which other number system, is 121 a perfect square? Bonus : Let us look at another puzzle based on different bases. 2. What is the missing number in the following sequence: 10, 11, 12,13, 14, 15, 16, 17, 20, 22, 24, 31, 100, - - , 10,000. (Hint: The missing number is in ternary notation) Find the solutions to these puzzles here .