http://www.kocw.net/home/cview.do?lid=f5d1e720d9285a7d
The number thoeory, especially the study of Prime Numbers, has such a long and rich history and captured the minds of great mathematicians that are known even today: Euclid of Alexandria, Fermat, Euler, Gauss, Hilbert, Dirichlet, Riemann, and Hadamard, to name only some of them. Not all the Prime Numbers are known yet and this fact of "not knowing" serves in protecting passwords and credit card numbers in the internet. There are yet unresolved conjectures and hypothesis such as Goldbach conjecture and Riemann hypothesis challenging future mathematicians.
