Everyone enjoys counting down to Christmas so much, that it seems to happen earlier and earlier each year. Well, sticking to the standard format of counting from 1st December down to 25th using a specially prepared calendar, we present the **Aperiodical’s 2015 Advent Calendar**, featuring behind each door not a small disappointing piece of chocolate, but a randomly chosen nugget of mathematical goodness for your enjoyment.

From YouTube videos to websites cataloguing number sequences, we’ve got a nice surprise for you each day. We’ll be adding each door as a post on the site, plus you can find them all collected together below, along with interesting number facts. Enjoy!