RT this to be entered to win a copy of the Mathematics 2020 calendar (from which the #dailymaths problems are taken), or a copy of "Power in Numbers: the Rebel Women of Mathematics." Drawing to be held when we reach 13,313 followers (it has two 13s, my favorite prime!).

We are getting very close! There will now be three prizes--the Mathematics 2020 calendar, a copy of "Power in Numbers: the Rebel Women of Mathematics," and a copy of either the adult or young reader version of "Hidden Figures." RT the top tweet to be automatically entered.

Almost there!

Less than 300 to go!!

About 200 to go. Everyone has a very good chance with so few RTs of the top tweet in this thread.

Way less than 100 to go now! Can we get this done before June 1? RT top tweet in this thread to be automatically entered.