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  1. N

    Next Number?

    0, 3, 15, 42, 90, ... What number comes next? There's something interesting about these numbers (at least to me). <- thats not a clue its just that this isnt just some random series, theres more to it that is mathematical, not personal or a bus route...
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    Prime pairs

    There is (as far as I know) no proof-for or against- that there are infinately many prime pairs such as 3, 5 or 29, 31... Anyway, is it intuitive to assume that there should be infinitely many pairs just b/c of the fact that there are infinitely many numbers? or does this have nothing to do...
  3. N

    Mile hill

    You and your dog run up a hill that is a mile long. Your dog runs half as fast as you. When you reach the top you immediately head back down. When you meet your dog, on your way down, he turns to follow you to the bottom. When your dog reaches the bottom, how far has he run?