Math’s “look-and-say” sequence goes: 1, 11, 21, 1211, 111221, 312211, 13112221, ... Each entry describes the one before it. We start with 1, then observe “we have one 1” and encode that as the next ...
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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