As someone with a B.S. in Pure Mathematics who is now a programmer, it makes my heart happy to see my true love at the top of HN.
I often wonder how it might have been if I just had stayed with math. Especially, after years of doing regular programming for the Web, recently I had to develop a computational geometry library. It had been years since I graduated but really made me feel nostalgic. I think I lost something when I left the field, but then again life is a lot easier now...