An introduction to pythagorean arithmetic
on the pythagorean Plato
on the fibonacci sequence, which makes the connection between fibonaccis rabbits, Pascal and the pythagorean triangular numbers.
more on the triangular numbers
other wonderful properties of numbers
pythagorean combinatorics and stoic logic
the pythagorean gnomon tradition in China
fibonacci polynomials
complete Pythagoras biographies and fragments translated by Guthrie
and the motherload:
Iamblichus Theology of Arithmetic
Nicomachus Introduction to Arithmetic