Would The Pythagorean Therom fall under that catogery?
Pythagoreus isn't a very commonly used name. Theorem isn't really either. I was thinking more along the lines of distance formula, point-slope formula and things along these lines.
Also, number theory is a very specific niche in mathematics. If you can't appreciate or realize (or otherwise conjure a care for) the beauty of the properties our infinite sets of numbers form, there's little reason to study it. It's not an extremely applicable branch of mathematics.