1, 11, 21, 1211, 111221. These are the first five elements of a number sequence. Can you figure out what comes next? If you're trying a bunch of arithmetic operations to make the numbers work, you're ...
From the second number onward, each number in the sequence is the product of the digits of its predecessor. The next two numbers are therefore 3 × 3 × 6 = 54 and 5 × 4 = 20. All subsequent numbers in ...
Some of the most satisfying number puzzles require little mathematical know-how. In fact, cracking the one below calls for thinking that is quite nonmathematical. I don’t know where or when I first ...
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