5, 13 and 137 are Pythagorean Primes

Professor Laurence Eaves on Pythagorean Primes - and why 5, 13 and 137 are three of his favourites!?

More on prime numbers: http://bit.ly/primevids

Fine structure constant on sixtysymbols at http://www.youtube.com/watch?v=WlSLIW0gZtk