*New Scientist*:

Inside the race to find the first billion-digit prime number

An interesting side-bar to the main article takes note that we have now calculated the value of the irrational constant pi out to 31.4 Trillion digits, a feat done by a Google developer from Japan, Emma Haruka Iwao.

And another interesting historical note: In 1588, the Italian mathematician Pietro Cataldi was able to prove that the number 524,287 is a prime number, and

*that would remain the largest known prime number for nearly two centuries!*

Boy, we've come a long ways since then!