The latest issue of the hexannual Mathematics Today, aside from having an interesting article on Google’s Pagerank algorithm, has a cool little puzzle called Enigmaths, which is basically a number crossword. The clues are things like, “6 across: multiple of the reverse of 7 down; 7 down: a square minus 6 across” which look impossibly circular but are in fact quite fun to solve. However, writing down lists of primes and such by hand is boring and time consuming, so I wrote some python code to help:

Simple Number Theory Tools.

(No, I don’t subscribe to a god damn maths magazine; it’s free in the maths building workroom.)