Tag Archives: perfect

The route puzzle

While poking around some old files I came across this puzzle: (Click for a larger version.) I didn’t make it, and I have no idea where I got it from (do you know?). But in any case, wherever it comes … Continue reading

Posted in arithmetic, challenges, number theory, proof, puzzles | Tagged , , , , , , | 7 Comments

Perfect age

Today is my birthday! This is the second and (barring any miraculous advances in medical science) final time that my age will be a perfect number. Unfortunately, the first time my age was a perfect number, I didn’t know what … Continue reading

Posted in meta | Tagged , , | 15 Comments